Malicious PDF — malware analysis report

Static analysis result for SHA-256 4289c76c93d28fef…

MALICIOUS

PDF

44.2 KB Created: 2020-08-12 05:25:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 12d3c62d12421c9627c75cc2f681e772 SHA-1: 4451ed171538213a33b9bf6879afd23fd287b77a SHA-256: 4289c76c93d28fef514b77bf48e529daf222090e7e6c1ddbb8b6cd987c329596
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a large number of embedded links, with the primary link pointing to a redirector service. This suggests the document is designed to lead the user to a malicious site through obfuscation. The ML classifier strongly supports the malicious verdict. No scripts were extracted from this sample.

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=basic+computer+networking+concepts+pdf
    • http://files.montsinaicog.org/uploads/1/3/2/7/132741433/7752455.pdf
    • http://pubufa.foodieplayschef.com/uploads/1/3/0/8/130874038/3950087.pdf
    • http://files.tutuadorabow.com/uploads/1/3/1/4/131453870/326832dccec281.pdf
    • http://files.pathwaysenrichmentacademy.com/uploads/1/3/1/6/131636589/jisokuw.pdf
    • https://cdn.shopify.com/s/files/1/0431/3900/6632/files/23458744652.pdf
    • https://cdn.shopify.com/s/files/1/0452/1892/2653/files/66742275240.pdf
    • https://cdn.shopify.com/s/files/1/0431/6895/6565/files/8263109845.pdf
    • https://cdn.shopify.com/s/files/1/0434/0219/9196/files/psychology_facts_about_love.pdf
    • https://cdn.shopify.com/s/files/1/0430/1992/7713/files/xakozen.pdf
    • https://cdn.shopify.com/s/files/1/0428/9134/6079/files/acknowledgement_for_industrial_training_project_report.pdf
    • https://cdn.shopify.com/s/files/1/0427/6820/3942/files/wijawedavad.pdf
    • https://cdn.shopify.com/s/files/1/0433/3935/0181/files/23905013594.pdf
    • https://cdn.shopify.com/s/files/1/0431/7852/4832/files/mokodejelojabekamis.pdf
    • https://cdn.shopify.com/s/files/1/0431/6309/1110/files/rc_calc_osrs.pdf
    • https://cdn.shopify.com/s/files/1/0430/0328/1571/files/wanunusiluxafuxewakewap.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/dewefezagabujam.pdf
    • https://cdn.shopify.com/s/files/1/0427/7387/2807/files/xeferumabavipexasam.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/

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000060d7.bin
a63990819b64b8d20e65acd905ce56dc4637497ed788c76a210b7a0a722eda04		 pdf-font-stream PDF embedded font (sfnt) at offset 0x60D7 5532 bytes
font_01_sfnt_off0000739e.bin
e55d6a30a365285aad35001640a4fda243d08710c925a174f9c10a59676d15d5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x739E 9872 bytes
font_02_sfnt_off00009573.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9573 4324 bytes

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