Malicious PDF — malware analysis report

Static analysis result for SHA-256 684926cea953bb76…

MALICIOUS

PDF

42.0 KB Created: 2020-08-03 03:16:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 368f3faf547449a46a470f7b4bd3828a SHA-1: 350d97b4bfd3f2e56058f4f5965af26da4afc4ba SHA-256: 684926cea953bb768aa9cb67097cda6bef7c5c726d87bb80caafd0e4f54eb559
162 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link disguised as a question about 'mrt exe'. The ML classifier and the redirector heuristic strongly indicate malicious intent. The document body, though heavily obfuscated, contains the malicious URL and references to other PDFs, suggesting a link farm or redirection scheme designed to lead the user to a malicious payload.

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=what+is+mrt+exe
    • http://files.rockyjohnsonlaw.com/uploads/1/3/1/3/131398419/xujim_pulifok_sulusijat.pdf
    • http://files.maoriart.org/uploads/1/3/1/4/131453355/c62c94218df.pdf
    • http://files.haciendalacapullana.com/uploads/1/3/0/7/130776594/93f08bd7b3645.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0435/0499/2408/files/22062243708.pdf
    • https://cdn.shopify.com/s/files/1/0430/8199/0304/files/14182728196.pdf
    • https://cdn.shopify.com/s/files/1/0432/3144/5149/files/franklin_aim_manual.pdf
    • https://cdn.shopify.com/s/files/1/0435/2396/5079/files/international_financial_management_eun_resnick.pdf
    • https://cdn.shopify.com/s/files/1/0431/7410/1149/files/bekasidofak.pdf
    • https://cdn.shopify.com/s/files/1/0431/5519/4011/files/fosizofafukuvemesajedun.pdf
    • https://cdn.shopify.com/s/files/1/0430/5354/7677/files/mumaxevudofe.pdf
    • https://cdn.shopify.com/s/files/1/0430/8484/1124/files/sosorikasegogu.pdf
    • https://cdn.shopify.com/s/files/1/0429/8794/6133/files/63656475628.pdf
    • https://cdn.shopify.com/s/files/1/0439/4464/0667/files/blue_sky_surf_report.pdf
    • https://cdn.shopify.com/s/files/1/0430/9313/1425/files/12550872952.pdf
    • https://cdn.shopify.com/s/files/1/0437/7087/1970/files/y8com_2_player.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_off00005b0d.bin
b59a5abceb0eaf62bf626f84e10b2f8e70ec8d32e0c7dd904d94b8a24865557b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5B0D 4548 bytes
font_01_sfnt_off00006a77.bin
f6752d17a62c167a8649cc5032875079a830549311175e356dd0cc6f7c1dea89		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6A77 10228 bytes
font_02_sfnt_off00008d6e.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8D6E 4324 bytes

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