Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5d7fe39eb1df86d…

MALICIOUS

PDF

45.4 KB Created: 2020-11-06 03:28:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: c8fbb7a49efa864fa10c5302fcd8494f SHA-1: 7827a0ca51639095615674083f5669c337f9d347 SHA-256: c5d7fe39eb1df86d65178d3126304a815b961b383738bb48ac9f7276b74fdfc9
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF document contains embedded links that point to known malicious redirector infrastructure, specifically `https://traffine.ru/123?keyword=the+sea+of+monsters+read+online+free`. The document body, though heavily obfuscated, appears to be a lure for free online content, suggesting a phishing or scam attempt. The ML classifier strongly flagged this PDF as malicious, reinforcing the observed malicious link behavior.

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://traffine.ru/123?keyword=the+sea+of+monsters+read+online+free In PDF document text
    • https://rawebitor.weebly.com/uploads/1/3/4/3/134337567/pogudefajugi.pdfIn PDF document text
    • https://murudogukezopo.weebly.com/uploads/1/3/4/3/134320821/kufisaten.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365638/normal_5f8945f9e95da.pdfIn PDF document text
    • https://xepefebew.weebly.com/uploads/1/3/4/4/134440437/menotofuzoxa.pdfIn PDF document text
    • https://lepitosamodovax.weebly.com/uploads/1/3/4/3/134335454/dodeforu.pdfIn PDF document text
    • https://kagadema.weebly.com/uploads/1/3/4/4/134456650/003e8ef571bed3d.pdfIn PDF document text
    • https://tavumake.weebly.com/uploads/1/3/2/7/132740551/cc8adff020613.pdfIn PDF document text
    • https://pefuxagofir.weebly.com/uploads/1/3/4/3/134359429/sodegeli.pdfIn PDF document text
    • https://tegugozitofo.weebly.com/uploads/1/3/0/8/130874592/gejezojuzigew.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/38d3e707-645e-40f3-ace5-37f8fd295cf0/walt_disney_s_leadership_style.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/efb67b67-5577-4f4f-973f-1963b72af36c/klipsch_r-10sw_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/81500339-3a0f-4c23-8850-1ad180cc4bf9/lixegezim.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_off000074b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x74B8 5096 bytes
SHA-256: 1184f86fa0cee11d62e0955191d1ebdbd216641b274260e5be24ad1d43c748cc
font_01_sfnt_off000085dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x85DC 10420 bytes
SHA-256: cb2bdc6aa2d1b2e24ae4e92b930eafc040425efea8979263fec2e981b5c65cb2

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