Malicious PDF — malware analysis report

Static analysis result for SHA-256 31d261dc4776c614…

MALICIOUS

PDF

71.9 KB Created: 2020-12-19 02:14:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: fb7538ff037df31d09d40066f6bf1a40 SHA-1: 775f20d3667e8754e4ac38a2dec4a627636ef70f SHA-256: 31d261dc4776c614c5c38479b7d6c7f7565aea9962b0adbf079b41b6cf3a85eb
214 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 'ggtraff.ru'. Additionally, it exhibits characteristics of a PDF link farm, with numerous external links, one of which is also flagged as a redirector. The ML classifier and ClamAV also strongly indicate maliciousness, classifying it as a phishing trojan. The document body is heavily obfuscated and appears to contain metadata rather than user-readable content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://ggtraff.ru/123?utm_term=who+i%2527d+be+lyrics+shrek+the+musical In PDF document text
    • https://sabiwivilo.weebly.com/uploads/1/3/4/3/134316676/be6d6.pdfIn PDF document text
    • https://viduxetejogat.weebly.com/uploads/1/3/4/6/134600114/6008c78845bfd.pdfIn PDF document text
    • https://tifunubuxeji.weebly.com/uploads/1/3/4/5/134523212/8d0c650380.pdfIn PDF document text
    • https://julasunanuk.weebly.com/uploads/1/3/4/3/134308365/5db51.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369334/normal_5f87e0f767c84.pdfIn PDF document text
    • https://buxiniti.weebly.com/uploads/1/3/4/3/134309366/dafuronusemos-peligivoxa-ziwadilenakeg-kudisikika.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421476/normal_5f9ca2f673e95.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/4becf665-1881-4467-9aa9-c50fcfd0cf41/el_libro_rojo_del_bombero.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/211afd1c-1b12-480e-ae57-dedddb66b0e6/dejepuzimap.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/811e7fa2-d924-408e-9f6d-3c129c08b172/dogfight_1_unblocked.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/51bb2685-f852-4c3b-a92e-5b19c4edf204/proof_of_taylors_theorem.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/02aa3569-2e98-4fcb-96f8-72f06bb320dd/16123163348.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/029b90a6-3f46-434b-ab09-a30d83fc28e1/96661057451.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_off0000d031.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD031 5532 bytes
SHA-256: d7524f120493e56ddabe1749204c33e228164201424c784b478f6a7568827e48
font_01_sfnt_off0000e2de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2DE 2032 bytes
SHA-256: 7cd63ea236a3a6d34ee5cfcf5f2ed40bd3c4c6d914ea15b4ac01f3e62163efdc
font_02_sfnt_off0000ec6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC6E 11516 bytes
SHA-256: 8d96206ee60cd0d567cacc3557bb41db0d7aefc84db7c4736509ba4f7cfb279b

Open this report in the interactive analyzer, or submit your own file for analysis.