Malicious PDF — malware analysis report

Static analysis result for SHA-256 5076d7942934f1d5…

MALICIOUS

PDF

66.9 KB Created: 2020-12-21 15:47:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 388c52620cd0cb375753f2f503f39d2d SHA-1: efe87e9f4c8ab5d3414808da651c96f6b526c7b7 SHA-256: 5076d7942934f1d57116167f751c8cc3d2b31d95d5a1b03314b7ed95fb61d81f
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics, including a critical finding for linking to known malicious redirector infrastructure. The document contains a mass of external PDF links, suggesting a link farm designed to obscure the ultimate destination. The primary malicious URL identified is https://ggtraff.ru/strik?utm_term=steam+gift+card+mexico, which is likely used to redirect users to a phishing or malware-hosting site. No scripts were extracted, but the presence of embedded URLs and the link farm behavior strongly indicate a phishing or malware distribution attempt.

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://ggtraff.ru/strik?utm_term=steam+gift+card+mexico In PDF document text
    • https://static.s123-cdn-static.com/uploads/4454575/normal_5fcd1001c9348.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366402/normal_5fad67322fbd0.pdfIn PDF document text
    • https://dakikizubebara.weebly.com/uploads/1/3/4/8/134889455/xugosipatozonedo.pdfIn PDF document text
    • https://penusifobituje.weebly.com/uploads/1/3/4/3/134314418/1638273.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/zamuriza/classroom_instructions_worksheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bb234fc9-4c42-48f0-bdc4-fd6ad32e4017/19672026115.pdfIn PDF document text
    • https://s3.amazonaws.com/ragejufa/3427515764.pdfIn PDF document text
    • https://s3.amazonaws.com/firudegix/castle_crashers_unblocked_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/47aca0b9-c6aa-4834-a6bc-270d346073f0/motameguzomimuzugurek.pdfIn PDF document text
    • https://s3.amazonaws.com/jobavo/english_grammar_tenses_in_telugu.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc570c5104edf1d779fad1f/t/5fca744e944ec9462b3b1246/1607103567413/battle_chasers_nightwar_2.pdfIn PDF document text
    • https://s3.amazonaws.com/jesidofefe/birds_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f2c3b5e3-7fd5-48c2-9774-de9b5b80f9a2/67269925908.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_off0000c72c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC72C 5304 bytes
SHA-256: b629e75f6a49066e3394a01caa66842b3655ad36991f7b70fa518f148d3685b8
font_01_sfnt_off0000d929.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD929 11456 bytes
SHA-256: 80132892ec17fbc38c672d84f51bef92b98fe2f14ce319be41f2a8096e69ca8e

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