Malicious PDF — malware analysis report

Static analysis result for SHA-256 7614cb83067f00d4…

MALICIOUS

PDF

130.9 KB Created: 2021-01-01 07:14:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: c260d4c281579ca7f49b52e81517e4f4 SHA-1: 72c2fdf1c1f693a9b5a06de765f4ec38a40076b7 SHA-256: 7614cb83067f00d4bf53529a9a3cb3246fbe38c7d64b862eef823f01fa641448
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains numerous embedded links, many of which point to known malicious redirectors or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier strongly flagged this PDF as malicious, and the presence of redirector links further supports a malicious intent. No scripts were extracted, but the primary attack pattern involves directing users to external, potentially harmful, websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • 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://traffmen.ru/123?utm_term=introduction+to+federalism+in+philippines In PDF document text
    • https://xitukuwelup.weebly.com/uploads/1/3/4/3/134340625/gipij.pdfIn PDF document text
    • https://genigudepa.weebly.com/uploads/1/3/1/0/131070712/8061633.pdfIn PDF document text
    • https://nosisakapu.weebly.com/uploads/1/3/4/7/134773138/6ae79c71695.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377662/normal_5fdc6f854c83a.pdfIn PDF document text
    • https://ruzunaxatan.weebly.com/uploads/1/3/4/3/134340268/9004319.pdfIn PDF document text
    • https://tifogufa.weebly.com/uploads/1/3/1/6/131637606/talezafidadoko.pdfIn PDF document text
    • https://mutovowi.weebly.com/uploads/1/3/4/8/134862221/728972f5.pdfIn PDF document text
    • https://kefanizitadibuz.weebly.com/uploads/1/3/4/3/134328212/robifoxoderutad.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/lebaxa/novivuwagazipisuril.pdfIn PDF document text
    • https://s3.amazonaws.com/vezumobigodub/minecraft_lucky_block_mod_1.7.10_forge.pdfIn PDF document text
    • https://s3.amazonaws.com/fosagoba/bike_photos_hd_free.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001ae4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AE4E 5332 bytes
SHA-256: f00621ab25c3633d59844e02fee512c554306f41ce7261a80210f8573d2fb5b4
font_01_sfnt_off0001c041.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C041 12728 bytes
SHA-256: bdfa8efbfd8fa8b3621949a62a036f7524fa64910cd2d8b5bbb324e334dfd926
font_02_sfnt_off0001e8e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E8E9 16092 bytes
SHA-256: 175e0235b73e7e9d4c172dfae07370378d962b543538eed74668470b21174778

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