Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fe6f60dcb06a790…

MALICIOUS

PDF

76.9 KB Created: 2020-11-17 10:32:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4ab346a68c89ae2122969bd5dd230ebb SHA-1: 1dcd570b20db54946896eb7ab50e9823e9967a34 SHA-256: 8fe6f60dcb06a790a999a76782d0c1eb9f0d4ccd8880d987c1c8bae927e3a2b6
214 Risk Score

Malware Insights

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

The PDF contains multiple heuristics indicating malicious redirection and a link farm, including a critical finding for a link to known malicious redirector infrastructure. The embedded URLs, such as 'https://cctraff.ru/123?utm_term=psychsim+5+hemispheric+specialization+answers', are likely used to direct users to phishing or malware sites. Although no scripts were explicitly extracted, the PDF structure and embedded links strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://cctraff.ru/123?utm_term=psychsim+5+hemispheric+specialization+answers
    • https://xudiruxi.weebly.com/uploads/1/3/4/6/134630049/5ad243a1429041.pdf
    • https://cdn-cms.f-static.net/uploads/4367667/normal_5f88f34ee0d97.pdf
    • https://cdn-cms.f-static.net/uploads/4372980/normal_5f99f27f869ff.pdf
    • https://vivenovexo.weebly.com/uploads/1/3/4/6/134695888/jovapibu.pdf
    • https://pebawatiwokup.weebly.com/uploads/1/3/4/5/134576243/rovozaviwekin_zomuwivelax_lojitofa_rutiwagi.pdf
    • https://cdn-cms.f-static.net/uploads/4365575/normal_5f8709d80c8f2.pdf
    • https://xoforovujedopod.weebly.com/uploads/1/3/4/5/134587448/xagekojeranoxo-bovez-kugomu-boguset.pdf
    • https://cdn-cms.f-static.net/uploads/4385422/normal_5f9cbb691c879.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/nademopor/let_s_be_rational.pdf
    • https://s3.amazonaws.com/widuxade/android_apk_editor_windows.pdf
    • https://s3.amazonaws.com/jutenojamega/67194781369.pdf
    • https://s3.amazonaws.com/bopuxosavubare/pomarigenulubiwabanakij.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_off0000d9f7.bin
fad28932731445bfcfe87fe510c9c236974ce8331aa06a74ed589511e8541e02		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD9F7 5544 bytes
font_01_sfnt_off0000ecc9.bin
6770b790c1a5cd8a65f47d267670d46a781e8c829c1336531cbc23f75b585ca7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xECC9 10712 bytes
font_02_sfnt_off0001118a.bin
de4163f0fd1d786dd9f436dfe932c333ad362cf0c60848d122a597d9c22621ff		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1118A 16088 bytes

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