Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a5175afc8e8d627…

MALICIOUS

PDF

37.4 KB Created: 2020-08-07 08:48:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b670b6751fb576f2e49cd5c4a018b00f SHA-1: 4083f4d26b194cac694596a1f87e0458553fb9e9 SHA-256: 6a5175afc8e8d6277be58c0b30dfb69daf7ad532e5008056de3723d0d0624791
194 Risk Score

Malware Insights

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

This PDF file contains numerous embedded links, many of which point to a link farm infrastructure designed to redirect users to malicious content. One prominent URL, 'https://ttraff.cc/pify?keyword=bacilos+gram+negativos+fermentadores+pdf', is flagged as a malicious redirector. The document also exhibits characteristics of a password-protected archive lure, suggesting it's part of a multi-stage attack. The ML classifier strongly indicates maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.cc/pify?keyword=bacilos+gram+negativos+fermentadores+pdf
    • http://files.monicaek.com/uploads/1/3/2/7/132710628/revufumij.pdf
    • http://files.dpmine.com/uploads/1/3/1/3/131380728/1730996.pdf
    • http://files.christinacarnesphotography.com/uploads/1/3/0/9/130969761/voxokukavezubi.pdf
    • http://files.mcyaf.com/uploads/1/3/0/9/130968921/naxekadolufelo-mokegorito-bosadaje.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/2273/6798/files/tonoramejati.pdf
    • https://cdn.shopify.com/s/files/1/0437/9040/1687/files/mekajezidivevasigim.pdf
    • https://cdn.shopify.com/s/files/1/0432/0778/6654/files/xadefafigiloleni.pdf
    • https://cdn.shopify.com/s/files/1/0430/6327/9767/files/17586571492.pdf
    • https://cdn.shopify.com/s/files/1/0430/0849/1673/files/1502374627.pdf
    • https://cdn.shopify.com/s/files/1/0428/3393/6547/files/25703833504.pdf
    • https://cdn.shopify.com/s/files/1/0433/3630/2750/files/python_float_decimal_places.pdf
    • https://cdn.shopify.com/s/files/1/0431/5411/2672/files/korulesagigutugogezo.pdf
    • https://cdn.shopify.com/s/files/1/0435/3484/4059/files/32663432836.pdf
    • https://cdn.shopify.com/s/files/1/0436/0785/1171/files/tibazogubutemuwesoninaf.pdf
    • https://cdn.shopify.com/s/files/1/0429/5095/1066/files/76971333175.pdf
    • https://cdn.shopify.com/s/files/1/0428/4448/7836/files/dallas_county_assumed_name.pdf
    • https://cdn.shopify.com/s/files/1/0432/7548/5339/files/discord_wont_pick_up_my_mic.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005432.bin
872b581dc4bd91fdb76fed79e3feb7e412cc6833c9df802b1a2c1ffe9011fb28		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5432 5584 bytes
font_01_sfnt_off00006722.bin
f292dd23c656709265bc77c1ab9d2ecb26a6b2f9418d1dd77d0700c859be4cf9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6722 9836 bytes

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