Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f03116a6f9c9715…

MALICIOUS

PDF

66.8 KB Created: 2020-12-18 01:45:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: c8eaf1eabbb0e5959b7c6bfae65f9ef5 SHA-1: 246ba27191ef99a3413c1ddea4f99440600a158f SHA-256: 1f03116a6f9c9715513bdf3c5c2c43ca22ef834e01b906dc03359dc426cca6a5
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by multiple heuristics, including PDF_SEO_LINK_FARM and ML_NYX_PDF_MALICIOUS, indicating a high likelihood of malicious intent. The presence of numerous external links, including one to 'trafffe.ru', suggests an attempt to redirect users to potentially harmful websites. Although no scripts were explicitly extracted, the PDF structure and link farm heuristic point towards a phishing or malware distribution scheme.

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
  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://trafffe.ru/aws?utm_term=indonesia+vpn+latest+apk PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4470380/normal_5fc151a39dca9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452607/normal_5fb2dab955030.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417140/normal_5f9d26f9daa61.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4443801/normal_5fca74b66fc0e.pdfIn PDF document text
    • https://belafawejogawol.weebly.com/uploads/1/3/4/5/134583754/9074411.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475219/normal_5fa742e6ac067.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/lixuduwonifa/46228831598.pdfIn PDF document text
    • https://s3.amazonaws.com/fulosobezur/42670056876.pdfIn PDF document text
    • https://s3.amazonaws.com/guxosa/19877732272.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/61a13f85-ad0a-4914-b841-38e03129d0f4/7470278307.pdfIn PDF document text
    • https://s3.amazonaws.com/gowupuzokowuxes/naruto_season_1_ending_song.pdfIn PDF document text
    • https://s3.amazonaws.com/mulerux/linub.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/95a1ef67-5c5c-4d70-a646-0c2892c64fa9/jizolunax.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc28d4a3398ff7515387b94/t/5fc56f599b1ed0353894eefe/1606774620140/sportline_pedometer_342.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_off0000cc9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC9A 4916 bytes
SHA-256: 2be50dc15848b52a6751fd425271f60282ef86bcfebf27a87c8c2042515bc755
font_01_sfnt_off0000dd6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD6D 9824 bytes
SHA-256: eadbef73f716bcb2bcad2963479a4471dc0ac24b8ad107e0204d210be81ea404

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