Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef40922ebdf50af3…

MALICIOUS

PDF

55.2 KB Created: 2020-10-27 06:02:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 7acad738e6cb326f4b526668df9c67e0 SHA-1: d95864f57e57b88ba5b8a25486457195e838efcb SHA-256: ef40922ebdf50af3c35789fe26e1dd0f784841ac9554c3da3f4d1b84153ecbed
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

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 and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • 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://gettraff.ru/strik?keyword=ff14+suzaku+guide+deutsch In PDF document text
    • https://wajiresejepo.weebly.com/uploads/1/3/0/7/130774962/luvatofa_litutibub_getege_leledo.pdfIn PDF document text
    • https://xojerajap.weebly.com/uploads/1/3/1/3/131384359/1392291.pdfIn PDF document text
    • https://vekejuritikoj.weebly.com/uploads/1/3/1/8/131857631/wurogopijeza.pdfIn PDF document text
    • https://votawaxamudogop.weebly.com/uploads/1/3/4/4/134400347/godix.pdfIn PDF document text
    • https://nagigezivozitos.weebly.com/uploads/1/3/4/3/134340852/6565732.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0502/3744/0154/files/mizowexujejotuwakodozetup.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0502/5277/5604/files/oxford_handbook_of_commercial_correspondence.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0498/9331/0631/files/vicks_vaporizer_model_v150_instructions.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0488/2854/7237/files/download_struckd_3d_game_creator_mod_apk.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/2627/6774/files/braun_series_9_cleaning_station_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/zonivezada/pewuzog.pdfIn PDF document text
    • https://s3.amazonaws.com/fibesezati/habanera_carmen_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/vibuvomomuv/naxonosixuwew.pdfIn PDF document text
    • https://s3.amazonaws.com/jamokaroxoj/ziwepaluditokesebarusodul.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/689b5043-f4fa-4bdc-89d6-2823222f2ee6/83966746382.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b8c993d9-0446-41cd-94b6-7e0eb4a50cac/12232755092.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7dfc3e69-7bad-4be8-b13f-817bc6361d03/bijegulanopadusazogawakop.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/03e4b49f-5ce3-42cd-879f-e3b31db53793/international_economics_theory_and_policy.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://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_off000075c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x75C6 3144 bytes
SHA-256: b40d469399671e1c2c76f3af1470a846a740c7eceb94c45246375f4356e4671a
font_01_sfnt_off000080f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x80F3 5364 bytes
SHA-256: 975fc4f8e04740997dad678465e822288b16deb9e1e063f6518f36af13f38fa0
font_02_sfnt_off0000933e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x933E 11444 bytes
SHA-256: efe5972094c7aaf1aa4a74827025b05040f609089106c858753c41e5cec5d780
font_03_sfnt_off0000b96b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB96B 16204 bytes
SHA-256: 541fa2b6826b0add99b7d5a173ef1e6a5567607b5192f75b810eb17d6a563501

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