Malicious PDF — malware analysis report

Static analysis result for SHA-256 b312ffc0fd60649a…

MALICIOUS

PDF

73.6 KB Created: 2021-01-06 06:03:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 438470bf0eca8877efcf7657134f4749 SHA-1: 753ae83b5f0f3f85be125f5725629f6a991f9662 SHA-256: b312ffc0fd60649a9b5302a772581c83f0445134042de1be00703cdfaeaac06d
214 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector. The document body, though heavily obfuscated, suggests a lure related to game cheats, likely to drive traffic to malicious sites. The presence of multiple external PDF links further indicates a link farm or redirection strategy.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://traffking.ru/aws?utm_term=gta+san+andreas+all+cheats+pc+pdf In PDF document text
    • https://firudofomupavu.weebly.com/uploads/1/3/1/3/131384713/8965583.pdfIn PDF document text
    • https://mawanegofarate.weebly.com/uploads/1/3/4/4/134466522/pamizozelopifam.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380082/normal_5fd1d656163e9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/kulinisokakewi/foputufijifemuv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b2e9ec00-a1b4-468f-a632-fca7467e62ee/sixakuragokotekelimatev.pdfIn PDF document text
    • https://s3.amazonaws.com/wizidimawag/rusobanijizulekogikogokop.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c906f8b5-9362-4b9a-812e-a1834b67f848/jixenifemedobavideke.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aa294fb8-a5f7-4989-b406-9cfa448cff1f/kanikanum_neram_mp3_ringtone_downloa.pdfIn PDF document text
    • https://s3.amazonaws.com/tomaxade/zumid.pdfIn PDF document text
    • https://s3.amazonaws.com/ladiwuzetawedi/criminal_movie_tamil_dubbed.pdfIn PDF document text
    • https://s3.amazonaws.com/xezujuxoz/free_live_wallpaper_for_iphone_5s.pdfIn PDF document text
    • https://s3.amazonaws.com/kesumasaka/39872928617.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b34a9d40-59b5-402f-99be-2d461bd466cd/16244972792.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6b1a30c5-bc57-4437-9424-696a9315cd5d/think_thru_math.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e33c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE33C 5272 bytes
SHA-256: aa2d4abcc3544b68c77e774e3913c93ecc1244df909a53c52631a75a6cd2dc05
font_01_sfnt_off0000f525.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF525 10952 bytes
SHA-256: c7f4568fb4c4b2cce1cd4de4d340628a944cd1ddb92e3b620f8a2cfc27e214cc

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