Malicious PDF — malware analysis report

Static analysis result for SHA-256 e99c27b75fc91dce…

MALICIOUS

PDF

81.2 KB Created: 2020-12-19 11:20:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 542d49d183e6fcbfadfb4b57c43e3251 SHA-1: 91b991deca879ec8557a42449f7f74a69507e6c7 SHA-256: e99c27b75fc91dcef660138c609be75a68d646023a944b76a0a587359648df0e
254 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains multiple heuristics indicating malicious redirector links and SEO link farming, with a high ML classifier score and ClamAV detection. The primary malicious URL identified is https://cctraff.ru/aws?utm_term=android+police+best+twitter+client, which is used to redirect users to further malicious content. The document body is heavily obfuscated and appears to be junk data, but the presence of malicious links is sufficient to classify the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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/aws?utm_term=android+police+best+twitter+client In PDF document text
    • https://cdn-cms.f-static.net/uploads/4368227/normal_5fdc35ff26a09.pdfIn PDF document text
    • https://dutitujazekap.weebly.com/uploads/1/3/0/8/130814390/7354785.pdfIn PDF document text
    • https://sisaseno.weebly.com/uploads/1/3/0/7/130776680/52583bd4215.pdfIn PDF document text
    • https://xerutofen.weebly.com/uploads/1/3/4/5/134578778/kebigojazutur_selabugewexe_zedusamu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456379/normal_5fbc36c66f8b2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbf4c395147b14804297218/1606372410160/ground_elk_recipes_pasta.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc7aad65fa98a681f0fdb69/t/5fcf01ec76f3eb1a46d9d098/1607401965440/511_traffic_golden_gate_bridge.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc5de01bd14ff0dd2be9a03/t/5fceaf26788d7c4f39b9bcde/1607380774756/71131030861.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc390e0f9866f3fd2e4e56d/t/5fc7d050440ab22dc9767042/1606930512837/33509269473.pdfIn PDF document text
    • https://s3.amazonaws.com/wivunonovef/do_senior_citizens_need_a_fishing_license_in_nc.pdfIn PDF document text
    • https://s3.amazonaws.com/wipotegadodorek/7642813719.pdfIn PDF document text
    • https://s3.amazonaws.com/lososimap/age_of_empires_ii_the_forgotten.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fffa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFFA 5080 bytes
SHA-256: 10f199529be0987c3efbbf7e17f07de3665e0e0bbe24da89fcbdadcd06ae7276
font_01_sfnt_off0001115f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1115F 11272 bytes
SHA-256: 1cfa6b2580a574eb18b84c74cc8d602c74737f454b9b5e3a33848b5747859075

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