Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d9fe314b574d96a…

MALICIOUS

PDF

131.4 KB Created: 2020-08-23 11:28:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 037f221107cfd00d39333294b4e8ee2f SHA-1: 19a5eafbf418b21ff061519ffcd601c24be44cce SHA-256: 6d9fe314b574d96a3017255e2208cf7fb1dc4d1f400eac2723d7bf7f32e73b09
162 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure, specifically 'https://ttraff.ru/pify?keyword=severe+hypocalcemia+guidelines'. Additionally, it exhibits characteristics of a PDF link farm, with numerous external links, many pointing to Shopify-hosted PDFs. The ML classifier also flagged this PDF with high confidence. The document body, though heavily obfuscated, contains the malicious URL, suggesting an attempt to direct users to a harmful site, likely for phishing or malware delivery.

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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.ru/pify?keyword=severe+hypocalcemia+guidelines
    • http://files.carpetcleaningrestorationmarketing.com/uploads/1/3/2/6/132682030/nevuvojedig-zovub.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0441/3744/7576/files/officer_buckle_and_gloria.pdf
    • https://cdn.shopify.com/s/files/1/0437/5573/3153/files/fazojulogugozolokeragojix.pdf
    • https://cdn.shopify.com/s/files/1/0428/5503/9135/files/73285699363.pdf
    • https://cdn.shopify.com/s/files/1/0430/5063/1319/files/19250676283.pdf
    • https://cdn.shopify.com/s/files/1/0434/5724/9430/files/nulugaturo.pdf
    • https://cdn.shopify.com/s/files/1/0429/4639/6326/files/sivedalopujesekaru.pdf
    • https://cdn.shopify.com/s/files/1/0430/7392/9378/files/phet_forces_and_motion_basics_answer_key.pdf
    • https://cdn.shopify.com/s/files/1/0438/0426/2561/files/22602932326.pdf
    • https://cdn.shopify.com/s/files/1/0429/6844/9180/files/wigetewowaginurotit.pdf
    • https://cdn.shopify.com/s/files/1/0428/8151/5673/files/duxidujoreroz.pdf
    • https://cdn.shopify.com/s/files/1/0435/4503/4911/files/50781540955.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001b118.bin
b8919bac2133d056e6845b031da2e4f29c2207f8eb952029e82d3f88f2125b89		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1B118 5752 bytes
font_01_sfnt_off0001c48a.bin
2d0ef44b630429f8b4341c080bf8506d464416b82cb5eb39cb47491b16e5a51e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1C48A 10868 bytes
font_02_sfnt_off0001e99e.bin
279195ee2b87fb69461bdc38caaa322899e25c916075efe2c9600159a330b549		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1E99E 16388 bytes

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