Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc7b118fb5222128…

MALICIOUS

PDF

105.9 KB Created: 2020-09-06 14:30:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2a4d9cfdcfd4d1672cb3c1e47c38d6ce SHA-1: 21d9656cb521c641d20a97fd39d7fee98003da06 SHA-256: fc7b118fb5222128871a5b0aa1f8aa597929aefb86b2e59848540d567478dbbb
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains numerous embedded links, with one critical heuristic identifying a link to known malicious redirector infrastructure. The document body, though partially corrupted, contains the URL 'https://ttraff.club/wix?keyword=bus+games++2017+pc', which is also flagged as malicious. The presence of a large number of external PDF links, many hosted on static.usrfiles.com, suggests a link farm or SEO poisoning tactic to drive traffic to the malicious redirector. The ML classifier also strongly indicated maliciousness.

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.club/wix?keyword=bus+games++2017+pc
    • https://static.usrfiles.com/ugd/8d46c2_1bd1bea28f3d4490864528d14aebf9fe.pdf
    • https://static.usrfiles.com/ugd/3b47cb_54304e640e4544e6906f376d0eb53cc4.pdf
    • https://static.usrfiles.com/ugd/7f614e_38c9527a523842bc9f520038257bc010.pdf
    • https://static.usrfiles.com/ugd/2f07a1_0220d0ae9f8747ed9b61868afe0df71a.pdf
    • https://static.usrfiles.com/ugd/361045_b73d82cac4464f67ac534aaa8d3b0fb0.pdf
    • https://cdn.shopify.com/s/files/1/0432/0306/8068/files/gewoborevedapi.pdf
    • https://cdn.shopify.com/s/files/1/0437/4708/2389/files/nasudopefawijebad.pdf
    • https://static.usrfiles.com/ugd/c3548c_f05e2cb53a494e50b9d2b33b01906bc4.pdf
    • https://static.usrfiles.com/ugd/b8c837_2d77f2b57c8a43fd8b1c7c0d218342df.pdf
    • https://static.usrfiles.com/ugd/575363_63101122c01a4598a2c3d00bf2edfb9c.pdf
    • https://static.usrfiles.com/ugd/3794ad_fba5f0f75b394fc1a6e842aec38d8301.pdf
    • https://static.usrfiles.com/ugd/d2759c_82b172dd92af4399939e0089c95e83fc.pdf
    • https://cdn.shopify.com/s/files/1/0446/4757/9811/files/magic_bullet_theory.pdf
    • https://cdn.shopify.com/s/files/1/0431/7564/1247/files/36955255089.pdf
    • https://cdn.shopify.com/s/files/1/0431/8704/4510/files/emotional_intelligence_appraisal_test.pdf
    • https://cdn.shopify.com/s/files/1/0433/4760/7720/files/ohe_a_voda_rukv_tetovanie.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001631c.bin
24546d7b9d9cfd98b4b24d0be8c15e1f626af2a0c1a93f4da1170ca8667bd70c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1631C 5580 bytes
font_01_sfnt_off0001761f.bin
44f74dbd4128c173fa87563f4618c2780fdcc3abbb45216d7aadb5ecbcbded7e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1761F 10652 bytes

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