Malicious PDF — malware analysis report

Static analysis result for SHA-256 63e888035ed3f064…

MALICIOUS

PDF

69.2 KB Created: 2021-01-08 06:06:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 38680d2a4f721d56daeedd1b4256d2ab SHA-1: ee0ac5f63a179a56aa77bed22e2332eca5adcb6e SHA-256: 63e888035ed3f06437320ecbd3ad855669fb6cd6c53a82432f1dc035faab8444
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://cctraff.ru/123?utm_term=enchanted+learning+animal+cells'. The ML classifier also strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the nature of the redirector suggests an attempt to lure the user to a malicious site, consistent with phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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=enchanted+learning+animal+cells In PDF document text
    • https://static.s123-cdn-static.com/uploads/4490140/normal_5ff4b3bed562d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464724/normal_5fe932e7c6b0a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4492915/normal_5fc531ee7b3e5.pdfIn PDF document text
    • https://cdn.sqhk.co/birofinud/cghwjc6/dunifikinu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392664/normal_5faeb00df11a4.pdfIn PDF document text
    • https://cdn.sqhk.co/vukobefebu/tFA3Phe/suppress_definition_in_spanish.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/cb2158c9-e8d8-4ff5-84ff-7f4e72f94b71/jifajemekitipidi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ba16da7a-3729-477e-a3f5-6f744fd33b15/peoria_county_traffic_court_records.pdfIn PDF document text
    • https://s3.amazonaws.com/faxaxos/picsay_pro_apk_mod_2019.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2a276c48-e588-49e7-81b6-4cd746e75375/19077418575.pdfIn PDF document text
    • https://s3.amazonaws.com/vunizi/betefowemove.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c47b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC47B 4988 bytes
SHA-256: 0f0aa0343bbe928da609389afa3798157b1b0b0406a07429164de993d282ab74
font_01_sfnt_off0000d533.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD533 11168 bytes
SHA-256: 617212721275486739b8674aede0d7e71a6864c81d374add936f0a0f269160cf
font_02_sfnt_off0000fa3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA3B 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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