Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c7d53d5b23cb350…

MALICIOUS

PDF

47.4 KB Created: 2020-08-12 05:45:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1c08096d3ac2317c5ef501ef6a442a8d SHA-1: 354b2c86e2acc87663cfeec2692827cac3d5964b SHA-256: 7c7d53d5b23cb350607154a81ac84283e98f3cf13c7dfcdf1ed7614fb6286c47
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, ttraff.com, which is likely intended to lead the user to a malicious site. The document also exhibits characteristics of a link farm, with numerous embedded links to other PDFs, suggesting a tactic to artificially inflate search engine rankings or distribute malware. 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://ttraff.com/pify?keyword=aprender+portugues+gramatica+pdf
    • http://files.doublemindedgod.com/uploads/1/3/1/8/131857758/970076dd2.pdf
    • http://wifagobi.dpbhouse.com/uploads/1/3/1/4/131406665/gisupuz-sopogok.pdf
    • http://wemilu.takakohasegawa.net/uploads/1/3/1/4/131409090/8375875.pdf
    • http://files.canineacresmaine.com/uploads/1/3/1/4/131407148/2040561.pdf
    • http://dosozebu.sugarrimbar.com/uploads/1/3/2/7/132740580/lejafuvu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0431/5519/4011/files/23565144014.pdf
    • https://cdn.shopify.com/s/files/1/0428/3056/1436/files/17967382285.pdf
    • https://cdn.shopify.com/s/files/1/0431/8255/5297/files/lithium_ion_polymer_battery.pdf
    • https://cdn.shopify.com/s/files/1/0428/9930/8700/files/lagirosigex.pdf
    • https://cdn.shopify.com/s/files/1/0429/8981/3909/files/milani.pdf
    • https://cdn.shopify.com/s/files/1/0430/9054/2743/files/aqw_quest_id.pdf
    • https://cdn.shopify.com/s/files/1/0431/7102/0957/files/selebesikaja.pdf
    • https://cdn.shopify.com/s/files/1/0431/1931/3053/files/220_bus_timetable_cork_2020.pdf
    • https://cdn.shopify.com/s/files/1/0428/7404/4579/files/royal_cash_registers_manual.pdf
    • https://cdn.shopify.com/s/files/1/0438/9496/4392/files/big_bus_budapest_map.pdf
    • https://cdn.shopify.com/s/files/1/0429/1392/3228/files/xovojetenipuzez.pdf
    • https://cdn.shopify.com/s/files/1/0436/3180/4574/files/blac_chyna_waist_trainer.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006a46.bin
bd3806745cf3144809ed873577ab54e3deabe2ae776573598bcd7314d8e986c4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6A46 5316 bytes
font_01_sfnt_off00007c3e.bin
b95491d1e0f63c885db32d5fcf79e899c847d864494c652a252e119a227d2aa5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7C3E 11332 bytes
font_02_sfnt_off0000a0f4.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA0F4 4324 bytes

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