Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b7bcfb5189542a2…

MALICIOUS

PDF

50.6 KB Created: 2020-11-03 03:32:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 665ec14c054e3b198638ac13a925e7da SHA-1: 2ba3052c0a36ae81e8faae0fa9200e0aa1ff11a3 SHA-256: 8b7bcfb5189542a27b2418c79f9da9234018c84c5505daf8f55d78f45d853e43
124 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains embedded URLs that point to known malicious redirector infrastructure, specifically 'https://cctraff.ru/strik?keyword=senryuu+shoujo+manga+online'. The document body also contains numerous links, suggesting a link farm designed to distribute traffic to potentially malicious sites. The ML classifier strongly indicates maliciousness, and the presence of redirector links supports a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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 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/strik?keyword=senryuu+shoujo+manga+online In PDF document text
    • https://xanuvomapimiv.weebly.com/uploads/1/3/4/3/134342034/verafafusupow.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424981/normal_5f9c03da75e55.pdfIn PDF document text
    • https://rizidapovo.weebly.com/uploads/1/3/4/3/134316848/funepu.pdfIn PDF document text
    • https://sanuvexugivi.weebly.com/uploads/1/3/1/6/131606490/wevowu.pdfIn PDF document text
    • https://zimiduninu.weebly.com/uploads/1/3/1/6/131637103/gozowu_nonosikatufu_xabiwujukil.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369784/normal_5f89437b8a9eb.pdfIn PDF document text
    • https://gokipeko.weebly.com/uploads/1/3/4/3/134351508/3580708.pdfIn PDF document text
    • https://fidevawane.weebly.com/uploads/1/3/0/8/130814252/8207449.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/f4abb361-7883-4c47-a973-cf9c62e51b72/82665735545.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b7074b3c-4bf6-4449-9568-87a01daf7977/futevidowonakapitugad.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/471f5ec9-afcb-4577-80f8-efd577766550/bowariw.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0500/4686/1478/files/oakland_middle_school_murfreesboro_tn.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005bdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5BDC 3280 bytes
SHA-256: 2bf5bd609669e64a72710177c3b929ef98d1ebafdfd4ebc2320714824d325b13
font_01_sfnt_off000067a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x67A7 5380 bytes
SHA-256: 648fd76f39ac9b9867b4f4a076aeacf935566d541109ef0e6ed7a457393520ec
font_02_sfnt_off000079cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x79CF 14308 bytes
SHA-256: 6523d88b2dc691e6200923020256af428e8b07b6c0d9350646a47169e1c7ea6c
font_03_sfnt_off0000a7ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA7EF 16236 bytes
SHA-256: 997595d2933deec86542aa352ebde321a2940a090914fc18004adf07a9d65956

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