Malicious PDF — malware analysis report

Static analysis result for SHA-256 8bc890183822826e…

MALICIOUS

PDF

42.6 KB Created: 2020-11-08 02:56:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 028447fc1a5a5326f5fe216dab9f5d18 SHA-1: 53e441b5e65936f4e2db71d7dada6975208f991b SHA-256: 8bc890183822826e63b98c657b4a29222d048eee9f8eb060467b6f5337f1eb3c
124 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to known malicious infrastructure, specifically `https://cctraff.ru/aws?keyword=ppsspp+apk+games+file`. The document body, though heavily obfuscated, contains text related to 'ppsspp apk games file' and the malicious URL, suggesting a lure to download potentially harmful content. The ML classifier strongly flagged this PDF as malicious, and multiple heuristics indicate malicious redirector links and link farm activity.

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/aws?keyword=ppsspp+apk+games+file In PDF document text
    • https://cdn-cms.f-static.net/uploads/4448339/normal_5fa0a33f2ee5d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383912/normal_5f8c136a9d396.pdfIn PDF document text
    • https://palozemoxapido.weebly.com/uploads/1/3/4/3/134366311/6502380.pdfIn PDF document text
    • https://kivofijola.weebly.com/uploads/1/3/4/3/134309380/3845894.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368221/normal_5f897bb0a8192.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375341/normal_5f9483e949ab2.pdfIn PDF document text
    • https://fejamelaluboj.weebly.com/uploads/1/3/4/3/134311679/fuzajuvukavum_tokasegomimatu_konolakigazup_litagopu.pdfIn PDF document text
    • https://jikesekija.weebly.com/uploads/1/3/4/3/134367489/560f9a525a1f.pdfIn PDF document text
    • https://xavoxoxuda.weebly.com/uploads/1/3/1/3/131379246/buxilojax.pdfIn PDF document text
    • https://vilujelirajoki.weebly.com/uploads/1/3/4/3/134378771/tururonirifabiranab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384628/normal_5f9b0d2a740db.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407303/normal_5f9334471ad83.pdfIn PDF document text
    • https://wozogerodinanu.weebly.com/uploads/1/3/4/4/134498855/d5831b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off000066b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x66B6 5192 bytes
SHA-256: f594d72457674b04784938d3b0ba3c63b4556873be31250bf068165d063f5f37
font_01_sfnt_off0000785a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x785A 11072 bytes
SHA-256: 34c0baed34e0071d1c34a92efc13841cc3c3602630b8086e84196a27be7780cf

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