Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c76080ab4453479…

MALICIOUS

PDF

52.1 KB Created: 2020-07-17 04:44:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cf69c7aa26fb686631dfb6a18cd896d4 SHA-1: 661f389add9e705e9d69c175269488dfce895708 SHA-256: 8c76080ab4453479f56550a8b0a5d9144fa46b91795a14bdc2b21af90e9a2633
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a large number of embedded links, with one pointing to a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body is heavily obfuscated and appears to be junk data, suggesting the primary function is link distribution rather than content delivery.

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.ru/wb?keyword=video%20poker%20cheat%20sheet%20pdf
    • http://files.hiddendragonmartialartsacademy.com/uploads/1/3/0/7/130775539/3294151.pdf
    • http://files.tinyfarmlabs.com/uploads/1/3/0/7/130776343/233182.pdf
    • http://files.parsonsperiodpresentations.com/uploads/1/3/0/7/130739782/newazoj.pdf
    • http://files.missionographer.com/uploads/1/3/0/8/130814907/jujelizulejotus.pdf
    • http://files.judithgoldstonedesigns.com/uploads/1/3/1/4/131438423/3826532.pdf
    • http://files.ryanleekk.com/uploads/1/3/1/3/131398573/bivaj-piwuj-foganun.pdf
    • http://files.sarusfestival.org/uploads/1/3/1/4/131453894/3958547.pdf
    • http://files.jadepublishing.org/uploads/1/3/1/6/131636584/7a0d98704.pdf
    • http://files.judithgoldst
    • https://wapisamuvubu.files.wordpress.com/2020/06/sisapex.pdf
    • https://xozigun417683795.files.wordpress.com/2020/07/takavamakolimeraranovidog.pdf
    • https://ronefivuvan.files.wordpress.com/2020/06/telazitipurimunifu.pdf
    • https://fujezarek.files.wordpress.com/2020/06/fadazikujele.pdf
    • https://cdn.shopify.com/s/files/1/0432/1660/1249/files/wakevevesajirasenipaxij.pdf
    • https://cdn.shopify.com/s/files/1/0430/1661/8145/files/xelitesoxasamifumaku.pdf
    • https://cdn.shopify.com/s/files/1/0429/5095/1066/files/75998153616.pdf
    • https://cdn.shopify.com/s/files/1/0436/4858/1782/files/94775872328.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/pelezegagujagemubejapo.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/rumifagekesodurelakalon.pdf
    • https://cdn.shopify.com/s/files/1/0429/2290/1663/files/rofopabitozarexodezamis.pdf
    • https://cdn.shopify.com/s/files/1/0429/7120/1695/files/97665120230.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008f96.bin
16604841403a9e569d1f56d4283df25ad4292d220785f0a68766da9db21a5aa7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8F96 4924 bytes
font_01_sfnt_off0000a066.bin
d9c1462c54b620207b418d6eadfd0de47cd8edcd7b0852f1adcefc960f1a312b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA066 10092 bytes

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