Malicious PDF — malware analysis report

Static analysis result for SHA-256 12970b7835ad9163…

MALICIOUS

PDF

48.5 KB Created: 2020-08-10 22:32:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b56cbb14a160b08a16405abe8f32431a SHA-1: 637a4cf21cbe251669ab9a80e0a27088a84d2eff SHA-256: 12970b7835ad91637b3610d5840746ad213494066e7f78a98d34521ab9b3ac58
154 Risk Score

Malware Insights

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

The PDF contains a link that redirects to malicious infrastructure, masquerading as a job application document. The ML classifier strongly indicated maliciousness, and the document body contains obfuscated text alongside the malicious URL. The presence of numerous embedded links, many pointing to Shopify domains, suggests a link farm designed to distribute malicious content.

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://ttraff.ru/pify?keyword=cover+letter+for+employment+sample+pdf
    • http://files.fnaq.org/uploads/1/3/0/9/130969944/nivubuluro.pdf
    • http://files.susanstandfield.com/uploads/1/3/1/4/131408537/9efd7c8b1c.pdf
    • http://files.rubylashes.com.au/uploads/1/3/1/4/131453256/kilisonejoxevadokej.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0428/1538/9855/files/91189573405.pdf
    • https://cdn.shopify.com/s/files/1/0430/3690/1527/files/newerexotofikox.pdf
    • https://cdn.shopify.com/s/files/1/0432/6657/2452/files/zavukuriwukeviradaviremof.pdf
    • https://cdn.shopify.com/s/files/1/0431/4162/8072/files/bagigonukaxozom.pdf
    • https://cdn.shopify.com/s/files/1/0437/0635/1771/files/32631782305.pdf
    • https://cdn.shopify.com/s/files/1/0431/9110/7752/files/36937955276.pdf
    • https://cdn.shopify.com/s/files/1/0431/7108/6492/files/17980580311.pdf
    • https://cdn.shopify.com/s/files/1/0436/0149/4179/files/ccna_1_chapter_2_exam_answers.pdf
    • https://cdn.shopify.com/s/files/1/0432/4635/4592/files/subowa.pdf
    • https://cdn.shopify.com/s/files/1/0435/7623/0046/files/20923938894.pdf
    • https://cdn.shopify.com/s/files/1/0432/9259/0236/files/icmje_authorship.pdf
    • https://cdn.shopify.com/s/files/1/0434/1966/4540/files/desivezapelerafokikiwerem.pdf
    • https://cdn.shopify.com/s/files/1/0430/6763/7922/files/43528047169.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006ee4.bin
dc1d0a36f4f5e12d3f407bbcb0f8691a5971b7e44fe7de7a63013a36f7cda7b1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6EE4 5112 bytes
font_01_sfnt_off0000803c.bin
4aa864f719cf44f3aa8cf3bf59f4edc89855936e7a15ea7195183873b5471597		 pdf-font-stream PDF embedded font (sfnt) at offset 0x803C 11476 bytes
font_02_sfnt_off0000a6b8.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA6B8 4324 bytes

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