Malicious PDF — malware analysis report

Static analysis result for SHA-256 2dbcad260bdfda77…

MALICIOUS

PDF

90.9 KB Created: 2020-11-21 11:41:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: de4a56c37b8942b3c4bbc5d68338d835 SHA-1: 1b78e41e9e43768a2cc4d66cd6cb178ccb7d4c47 SHA-256: 2dbcad260bdfda77a07f7837dfad2a4cf7b29e3550d1d99d94f8c620817b58b2
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external PDF files, a common tactic for SEO link farms. One critical heuristic identified a link to known malicious redirector infrastructure, suggesting a phishing or malware distribution attempt. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the embedded links are the primary attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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/aws?utm_term=anastasia+cartoon+full+movie
    • https://cdn-cms.f-static.net/uploads/4378827/normal_5f8dd772100bf.pdf
    • https://cdn-cms.f-static.net/uploads/4495037/normal_5fab78eb44849.pdf
    • https://nuvisinuxaxo.weebly.com/uploads/1/3/1/3/131383681/rogadojimijawuzis.pdf
    • https://cdn-cms.f-static.net/uploads/4375694/normal_5fa8c2d6e7059.pdf
    • https://cdn-cms.f-static.net/uploads/4459320/normal_5fa7d25117c04.pdf
    • https://cdn-cms.f-static.net/uploads/4371543/normal_5f950fe09d208.pdf
    • https://cdn-cms.f-static.net/uploads/4380382/normal_5f902c4b54808.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/tuzamada/jixofuwinemulujusev.pdf
    • https://s3.amazonaws.com/fukezavazuj/dexakebovurer.pdf
    • https://s3.amazonaws.com/bepukuba/best_buy_wireless_charger_iphone.pdf
    • https://s3.amazonaws.com/vixuwogetiv/side_bangs_hairstyles_with_layers.pdf
    • https://s3.amazonaws.com/sefukirexuwekij/pegutavugozatuwovimu.pdf
    • https://s3.amazonaws.com/genedonapubefe/all_punctuation_marks_with_examples.pdf
    • https://s3.amazonaws.com/tedowafomaru/degigugesipux.pdf
    • https://s3.amazonaws.com/panalipolifod/45932785980.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000119a8.bin
94d98ff063b87359644e025e6d14bfbcd44ada4999b780dba66373350da068cc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x119A8 4956 bytes
font_01_sfnt_off00012a65.bin
4efe6e10104543e1ffb51b0ddf261a58d407e26673bef7c7761cd40dc8c70649		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12A65 11188 bytes
font_02_sfnt_off000150c0.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x150C0 4324 bytes

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