Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c1abd44eb5500bc…

MALICIOUS

PDF

59.3 KB Created: 2020-07-20 08:06:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 41a935570c17d99eee422d914d8b2269 SHA-1: ecf5a0c012de4aec7bf5733e11dfe148dcf85d94 SHA-256: 7c1abd44eb5500bcb1de5f3435f3cbd3d73e631a4d203e69a61b6f868abcca62
154 Risk Score

Malware Insights

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

The PDF contains a link to a redirector service, which is a common tactic for phishing and malware distribution. The embedded URL is designed to appear as a search result for a technical book, likely to entice users to click. The ML classifier strongly indicates maliciousness, and the PDF structure suggests it's part of a link farm.

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.com/wb?keyword=visual%20basic%20dot%20net%20black%20book%20pdf
    • http://files.nekitapilzphotography.com/uploads/1/3/0/8/130873781/6514734.pdf
    • http://files.beingwithcounsellinglondon.com/uploads/1/3/1/8/131871643/lavaletutafimasite.pdf
    • http://files.beyourradiantself.com/uploads/1/3/1/8/131857717/6086020.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/5771/6117/files/1611003004.pdf
    • https://cdn.shopify.com/s/files/1/0431/1970/6269/files/kitamukazugubatewilu.pdf
    • https://cdn.shopify.com/s/files/1/0427/9199/3500/files/55458860493.pdf
    • https://sokorirakuzi.files.wordpress.com/2020/06/fevugubetep.pdf
    • https://luwudilitu.files.wordpress.com/2020/06/73881488340.pdf
    • https://zegikoduna.files.wordpress.com/2020/06/lukajegaw.pdf
    • https://fokewofupipi.files.wordpress.com/2020/06/36832842838.pdf
    • https://tupipek.files.wordpress.com/2020/07/52914420677.pdf
    • https://cdn.shopify.com/s/files/1/0430/6662/2105/files/97634299117.pdf
    • https://cdn.shopify.com/s/files/1/0428/5893/8531/files/jafadesutu.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/xifadek.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/pufabupenidobuxix.pdf
    • https://cdn.shopify.com/s/files/1/0429/2568/6951/files/xewixoluwizekoxudefixo.pdf
    • https://cdn.shopify.com/s/files/1/0434/5010/6018/files/57158645035.pdf
    • https://cdn.shopify.com/s/files/1/0428/5507/1900/files/vupexewodebu.pdf
    • https://cdn.shopify.com/s/files/1/0434/1858/3192/files/46028358821.pdf
    • https://cdn.shopify.com/s/files/1/0431/1416/8480/files/giduriji.pdf
    • https://cdn.shopify.com/s/files/1/0432/4474/8950/files/negotisagef.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000a247.bin
83327f23233206c884a82aa117d45cc7caa7803871589abdfff3b7ac92f47a12		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA247 5104 bytes
font_01_sfnt_off0000b3ab.bin
165ea62bff68c85ee297ee4535a543904a9fffd8da571c48e398a67841c92670		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB3AB 13440 bytes

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