Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e67f2b40f1fe0f7…

MALICIOUS

PDF

49.4 KB Created: 2020-10-27 11:14:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 046db190567b3c00fdddef3acc99a4bf SHA-1: ed396ab9e40252c28a822e1b18ba8a1a7419585f SHA-256: 4e67f2b40f1fe0f7872e1d03026e6487133055513a26fce59eb3d79e0754dfd9
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a heuristic firing for linking to known malicious redirector infrastructure, specifically the URL https://cctraff.ru/strik?keyword=controls+on+cell+division+answers. Additionally, it exhibits characteristics of a PDF link farm, embedding numerous external links, many of which point to S3 buckets and other file-sharing services. The ML classifier also strongly flagged this PDF as malicious. The primary attack pattern involves luring users to malicious sites via embedded links.

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://cctraff.ru/strik?keyword=controls+on+cell+division+answers In PDF document text
    • https://jesasifewom.weebly.com/uploads/1/3/1/4/131453969/5753866.pdfIn PDF document text
    • https://noxepelobisuse.weebly.com/uploads/1/3/1/8/131871648/fdc80.pdfIn PDF document text
    • https://zepixufiguw.weebly.com/uploads/1/3/4/1/134108583/1457334.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/susopuzupure/masail-_e-_bahishti_zewar_download.pdfIn PDF document text
    • https://s3.amazonaws.com/nezanurugega/xobabetupuvodaxalapazez.pdfIn PDF document text
    • https://s3.amazonaws.com/henghuili-files2/japamebokepu.pdfIn PDF document text
    • https://s3.amazonaws.com/mijedusovineti/37876165180.pdfIn PDF document text
    • https://s3.amazonaws.com/wuniku/cerfa_vente_vehicule_remplissable.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/49770efa-9f01-4fc9-9621-7af9b14c6e9f/4_premiers_chiffres_du_n_ccp.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/afed788c-af1a-46c1-9f42-48808163014a/the_reawakening_tv_show_season_3_episode_1.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e116dec3-f53b-44da-a222-bd15c255d615/gidumudijodalasojof.pdfIn PDF document text
    • https://s3.amazonaws.com/henghuili-files/14815292768.pdfIn PDF document text
    • https://s3.amazonaws.com/zidenigad/sintesis_de_lipidos_en_la_celula.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0497/3897/3345/files/tumuxalegirisakenig.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0268/8004/9338/files/66984982340.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/7874/5756/files/keveramug.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/2524/3040/files/88894100530.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/8760/9497/files/90000266943.pdfIn PDF document text
    • https://s3.amazonaws.com/vogubivajavofu/87052757672.pdfIn PDF document text
    • https://s3.amazonaws.com/tesodagiwor/4185845502.pdfIn PDF document text
    • https://s3.amazonaws.com/mejados/relationship_between_assets_and_liabilities_in_balance_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/bitajemisajoz/scheme_of_work.pdfIn PDF document text
    • https://s3.amazonaws.com/lanubili/aramid_fiber.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008398.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8398 4988 bytes
SHA-256: 5f5fee1d70194988f07e77718b5dbbfecca1a672c8ae97276c580fbb94b70ef2
font_01_sfnt_off000094ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x94AD 10496 bytes
SHA-256: 414a3557d878e529eb41b7c393d986a01f07886ed5a59ddc33ce708ea7a71ced

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