Malicious PDF — malware analysis report

Static analysis result for SHA-256 71b8f404ed16fc64…

MALICIOUS

PDF

44.4 KB Created: 2020-09-20 01:36:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1647c57177f8756638b83ecd21bdf5c3 SHA-1: b165c1cccbcc5c564170f4dfa59dc548fd99b94e SHA-256: 71b8f404ed16fc64c40c106931ba0b07c0b1643e9767de0b91f82cae12ccb0bd
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, with a critical heuristic firing for a malicious redirector. The document body, though heavily obfuscated, contains text related to a lab report and includes the primary malicious URL. The presence of a large number of external PDF links suggests an attempt at SEO poisoning or a link farm 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.link/wix?keyword=osmosis+in+potatoes+lab+report
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0438/0193/6033/files/biblia_catolica_online.pdf
    • https://cdn.shopify.com/s/files/1/0433/1018/6654/files/71090820335.pdf
    • https://cdn.shopify.com/s/files/1/0430/8136/7712/files/airplane_pilot_simulator_game_free.pdf
    • https://cdn.shopify.com/s/files/1/0439/4372/3163/files/nusumunonavewimamawuwaw.pdf
    • https://cdn.shopify.com/s/files/1/0427/4431/6070/files/persona_3_fes_pcsx2_cheats.pdf
    • https://cdn.shopify.com/s/files/1/0432/0601/7186/files/57738118306.pdf
    • https://cdn.shopify.com/s/files/1/0458/0786/1926/files/24873791255.pdf
    • https://cdn.shopify.com/s/files/1/0431/3881/0023/files/tumusazujiwuvejis.pdf
    • https://cdn.shopify.com/s/files/1/0437/9007/4016/files/bleacher_report_soccer_transfer_news.pdf
    • https://cdn.shopify.com/s/files/1/0433/6100/9818/files/xowufewefitaf.pdf
    • https://cdn.shopify.com/s/files/1/0435/9038/5823/files/47766368991.pdf
    • https://cdn.shopify.com/s/files/1/0432/3049/4878/files/dominican_republic_world_travel_guide.pdf
    • https://cdn.shopify.com/s/files/1/0431/0115/9585/files/peaky_blinders_season_5_utorrent.pdf
    • https://fdc4d844-5937-4211-bfb3-cd8452610ebe.filesusr.com/ugd/237bf7_d4165670bebf4a97b31ef3f86adab31e.pdf?index=true
    • https://dc3b3219-9832-4aea-9bf4-29852141543e.filesusr.com/ugd/b3318b_55e9a905dba84ae2a591df01cf6dc63b.pdf?index=true
    • 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_off0000621b.bin
507e4d812e59ed7fe871809d9fb390523cfe908030fe8351f48eb43bada5bf33		 pdf-font-stream PDF embedded font (sfnt) at offset 0x621B 4920 bytes
font_01_sfnt_off000072a4.bin
3144d829d0b9c5e2f992943fdb6b9752bc855a3b529b7041a6539d7ed64d0c19		 pdf-font-stream PDF embedded font (sfnt) at offset 0x72A4 10416 bytes
font_02_sfnt_off0000963b.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0x963B 4324 bytes

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