Malicious PDF — malware analysis report

Static analysis result for SHA-256 83e0b3173cbba670…

MALICIOUS

PDF

71.8 KB Created: 2020-11-23 10:09:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 8d27fac26aa6c00e3e574a0449d28f01 SHA-1: 2908b9ba3eb2b269a2345bc907cad95bd14305fe SHA-256: 83e0b3173cbba67055d67b20523990756ebd714d3000b0e290327686fe1914e3
244 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous links, many of which point to redirectors and disposable hosting, indicating a link farm designed to distribute malicious content. One prominent URL, 'https://cctraff.ru/123?utm_term=basketball+star+apk+unlimited+money', suggests a lure related to obtaining unlimited money for a game, likely a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • 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://cctraff.ru/123?utm_term=basketball+star+apk+unlimited+money In PDF document text
    • https://cdn-cms.f-static.net/uploads/4506131/normal_5fb5fe50b7291.pdfIn PDF document text
    • https://xakekulipekez.weebly.com/uploads/1/3/4/3/134350488/babukevikexi.pdfIn PDF document text
    • https://xupulepil.weebly.com/uploads/1/3/4/3/134322414/fuxokafise-rijowowojum.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379236/normal_5fababbd5486b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368228/normal_5f87620b944b8.pdfIn PDF document text
    • https://ketabanajav.weebly.com/uploads/1/3/4/7/134707818/2e6bd6c42.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421048/normal_5fa53ebfd09a1.pdfIn PDF document text
    • https://bometisuvuxop.weebly.com/uploads/1/3/4/6/134684792/3b493f77e.pdfIn PDF document text
    • https://tuxitusonodedin.weebly.com/uploads/1/3/0/8/130873989/9d0620f650526.pdfIn PDF document text
    • https://zavigajigufuf.weebly.com/uploads/1/3/1/6/131637719/4a900adf.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/360e8e9a-ff14-4e9e-b8f3-14693ccd1832/introduccion_al_psicoanalisis_freud.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b35ce0fc-83f1-4919-b5e8-2c13140f55da/55164341053.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c5dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5DD 5460 bytes
SHA-256: 9b19c02b307800513ea6f2416c31582efe1bd70edf3be4ca5c8bd8de14e98d43
font_01_sfnt_off0000d859.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD859 10588 bytes
SHA-256: e068ad41395da15135d4fe13ad1cd37a015a0593d07498b9714fd522203ea89b
font_02_sfnt_off0000fcc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCC6 16192 bytes
SHA-256: 8638b2165434dffbf1aa746553e5382bf503f0ffe2108488142d2f369f5eb776

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