Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9b923014810c931…

MALICIOUS

PDF

63.0 KB Created: 2020-10-29 07:27:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 39b635e3816046a8c24fa5ba55050ccd SHA-1: e475e628c902a4fec4ad263faf06646073c90060 SHA-256: f9b923014810c9313ccdad803d95e10c1cdebdf07e968bbd6dfd0070f3ab72ad
162 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 5

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ggtraff.ru/strik?keyword=grade+7+maths+textbook+pdf+sinhala+medium In PDF document text
    • https://cdn-cms.f-static.net/uploads/4371020/normal_5f8f18ff3e160.pdfIn PDF document text
    • https://vabeliguteziji.weebly.com/uploads/1/3/1/3/131379360/tewulapugofuxa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406456/normal_5f95a67510288.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366045/normal_5f883f4f38697.pdfIn PDF document text
    • https://guwomenod.weebly.com/uploads/1/3/0/8/130873843/pejajofedaxevaw_kozadesupuke.pdfIn PDF document text
    • https://lixaworone.weebly.com/uploads/1/3/1/8/131871871/kadijafapesu_donasim_juwam.pdfIn PDF document text
    • https://xavoxoxuda.weebly.com/uploads/1/3/1/3/131379246/pivutufufisi_supofuzubi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/jemazejodep/xiaomi_air_purifier_2s_english_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4e026c3e-3692-4c98-bbba-24b10f48a17d/tatir.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/0863/8632/files/16363421013.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d33c1000-d4a7-4b1c-b9ee-b6aff83b9005/76164685471.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cc64502b-b35d-43d4-8a4f-04b211938d4f/nupotosisobevaxedena.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0501/9084/4084/files/swiggy_app_free_download_apk.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/8864/2197/files/crest_whitestrips_supreme_professional_review.pdfIn PDF document text
    • https://s3.amazonaws.com/dixaleko/sim_not_provisioned_mm2_att.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/0429/7375/files/66993135413.pdfIn PDF document text
    • https://s3.amazonaws.com/nezanurugega/ashrae_standard_62-_1989.pdfIn PDF document text
    • https://s3.amazonaws.com/kezemiradigu/download_abbyy_transformer_full_version.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2a944c15-c5cc-464e-a4dc-ed5d9e047898/lotizebofarodojadiro.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/7612/7394/files/seresto_flea_collar_for_dogs_instructions.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/4925/5061/files/how_long_does_a_direct_deposit_take_to_go_through.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0498/2449/7863/files/potudawinegarafipujoximal.pdfIn PDF document text
    • https://s3.amazonaws.com/jusuberu/talurisibamogatuz.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://sinhala.sourceforge.net/In PDF document text
    • http://sinhala.cvs.sourceforge.net/viewvc/*checkout*/sinhala/sinhala/fonts/CREDITSIn PDF document text
    • http://www.gnu.org/licenses/gpl-2.0.htmlIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000070b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x70B9 5664 bytes
SHA-256: 403de54a630e2c5af144691b8a380abb82f10006e17b38915f9eea27ddd3da79
font_01_sfnt_off0000839c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x839C 17864 bytes
SHA-256: 75ac284102d50c0d1c9ade4dad30ce3dc262cafb4140088201c211d4781e1b4e
font_02_sfnt_off0000b294.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB294 11100 bytes
SHA-256: e7896a43ddc25be72fc08de1c964b5bb0c89205aa845f4f9409d7434406d3b9b
font_03_sfnt_off0000d8e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8E0 16092 bytes
SHA-256: ea75db71c9df7250347a03039f742fcd189f5fc3f08964e696816fa8b5227073

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