Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4d649e87d39a600…

MALICIOUS

PDF

68.3 KB Created: 2021-01-09 02:44:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: ecde501555ff124d39d57f9f1ace9dfa SHA-1: d2d68e3af7ad93bad1272d1ba5a84e143a61745d SHA-256: b4d649e87d39a6005091f0e5abd65a296b00fe38d998f17d664be22410e95f8c
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file is identified as malicious by multiple heuristics and an ML classifier, including critical alerts for malicious redirector links and a link farm. The embedded links, such as 'https://traffking.ru/123?utm_term=game+maker+resources', are designed to lead users to potentially harmful sites. The document's structure and numerous links suggest an attempt to exploit users through a phishing or scam pretext, likely by directing them to a series of landing pages or further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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/123?utm_term=game+maker+resources In PDF document text
    • https://jazawimap.weebly.com/uploads/1/3/5/3/135346256/4102393.pdfIn PDF document text
    • https://fewevivib.weebly.com/uploads/1/3/0/8/130813821/vititobiwisib.pdfIn PDF document text
    • https://sajakuvidosub.weebly.com/uploads/1/3/4/4/134496924/vumidusifupe.pdfIn PDF document text
    • https://cdn.sqhk.co/kejopala/5PA76Pp/galaxy_s7_default_ringtone.pdfIn PDF document text
    • https://gexaxiwiwa.weebly.com/uploads/1/3/4/4/134480231/fd1ef307815e16b.pdfIn PDF document text
    • https://xajixaze.weebly.com/uploads/1/3/2/3/132302973/d43ebd08f3931b.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/399e156a-8f34-4047-964f-e763fdbd63ea/45931402231.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/569e7b75-e3c4-428b-9d68-f97bdfe59625/linear_variable_color_filter.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4787da0e-076d-413d-ab16-d6bdfea62321/principles_of_microeconomics_gregory.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8edf89dc-c1cb-477e-b757-1f381477244d/proof_of_payment_receipt_letter.pdfIn PDF document text
    • https://s3.amazonaws.com/xapijifas/gta_sa_cheats_for_android_free.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_off0000cfa7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFA7 5008 bytes
SHA-256: 62176e32243006505df15c731fb0f565f4dc908380fc11f54e6fd3070f8d72d7
font_01_sfnt_off0000e0a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0A2 10488 bytes
SHA-256: a0fbae98f6d8f6735555dd1001ba11ae2ff43b4544e9e07aa36b968925fcfa57

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