Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf5f3cf40f2d8740…

MALICIOUS

PDF

61.9 KB Created: 2020-09-30 18:32:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: e0ddb44b78940e6ca665cc1d22cf5e8f SHA-1: 1ae82402e8f910a8936dc007204389820415fdde SHA-256: cf5f3cf40f2d8740ad4d92e694cc5c2295ba9a5262c072fe64c2c7ccf1c19f8b
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to a URL that is likely part of a phishing or malware distribution scheme. The document body also contains this URL, suggesting an attempt to lure the user into clicking it. The presence of numerous other PDF links, many pointing to benign Shopify domains, indicates a link farm or SEO poisoning tactic to disguise the malicious intent. No scripts were extracted, but the embedded URL is the primary indicator of malicious activity.

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=the+a.+b.+c.+murders+agatha+christie+pdf In PDF document text
    • https://site-1036796.mozfiles.com/files/1036796/jokaponofizuvozatogojif.pdfIn PDF document text
    • https://site-1036716.mozfiles.com/files/1036716/tiwifopevirokukidew.pdfIn PDF document text
    • http://xikuz.darkside1.com/uploads/1/3/1/6/131636648/289548.pdfIn PDF document text
    • http://balurapez.chantal-pollier.com/uploads/1/3/0/7/130738591/dodipiwil.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://cdn.shopify.com/s/files/1/0428/8312/1319/files/shankara_video_song_by_hansraj_raghuwanshi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/9074/6271/files/blue_jackets_manual_18th_edition.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/0361/7173/files/muguzudoxada.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/2086/0064/files/fudosaguxakifeputinapon.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/8856/6680/files/thrust_bearing_skf.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/9123/7791/files/38906208147.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000094d0.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x94D0 3752 bytes
SHA-256: 0d589699a7d5e0ce289ce6595164a20421baf2ebe6df8a49acf99481604897c2
font_01_sfnt_off0000a21d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA21D 5324 bytes
SHA-256: f06199585eb52bcd9cfe8a8b214d62b5069259ae97d6d0eb1ce1b4afcb5c8b8e
font_02_sfnt_off0000b438.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB438 12152 bytes
SHA-256: 6c2cb9101e2cb31028d8817a679453c28863c7b706e898b429b98c5e07d26221
font_03_sfnt_off0000dc18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC18 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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