Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a105834edab3967…

MALICIOUS

PDF

91.4 KB Created: 2020-11-02 11:10:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 47cbae7cb1d55ea8f1c342081e91afb0 SHA-1: 3565960c511e8551c73966ac1f65740f1f60f17b SHA-256: 3a105834edab396723f8875f6f89be00d149c98e7eb46933be08e4f7bc335ef4
154 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, which is a common tactic for phishing and malware distribution. The document body, though heavily obfuscated, contains the same URL, suggesting it's the primary lure. The presence of numerous other PDF links, some pointing to benign content, indicates a potential link farm or SEO poisoning attempt to mask the malicious URL. The ML classifier strongly flagged this PDF as malicious.

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://gettraff.ru/strik?keyword=final+fantasy+type-0+hd+playstation+4 In PDF document text
    • https://cdn-cms.f-static.net/uploads/4367905/normal_5f990440ef25e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/b9043355-94b5-43a4-b6cd-037dc17fa19e/widijerizokaxasaz.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0266/9582/7629/files/hacked_spotify_premium_apk.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0499/8879/6575/files/future_tense_will_worksheet.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0498/9416/2621/files/world_war_ii_reading_comprehension_worksheets.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/8319/2738/files/army_men_strike_redeem_codes.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0490/0795/2039/files/visas.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/0629/4178/files/tusaxofefuxabos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f911348e-0521-4648-8d6e-bf889fea8473/zabagunulumuxuzuned.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/2937/6409/files/89125246943.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/4732/7646/files/xodojixejo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f6081958-c424-4dcc-8217-ae6a0e028f91/jizabifud.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/645178f7-f2bf-4427-83be-a045229b7eb7/gupemojatokofexotix.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c094.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC094 33132 bytes
SHA-256: 733280da919ff3b7872fd76fbc8fe912f090f622ff4da105ae63374eeeb02041
font_01_sfnt_off0001280c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1280C 5352 bytes
SHA-256: 2b803eed3c6d0d6b222b276afbfbefca1100586bb392f51129231e3bb89c8c25
font_02_sfnt_off00013a59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A59 10988 bytes
SHA-256: bb270519c050774e70f1b3278aec7971a2c3a1c2484191be6d65dc44a83c7111

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