Malicious PDF — malware analysis report

Static analysis result for SHA-256 f337d9e56b31b8b8…

MALICIOUS

PDF

45.5 KB Created: 2020-10-16 05:08:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: b61c024d17d75a6443b8eaf0ef9ae71d SHA-1: 12484e74abfde70ef4ecd34ec0e83a6b15715b77 SHA-256: f337d9e56b31b8b8a8baa98a7737b955bd0e6369eada4501efb860036352e246
184 Risk Score

Malware Insights

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

This PDF document is identified as malicious due to its function as a link farm, containing numerous external links to other PDFs. One of these links, 'https://gettraff.ru/123?keyword=fire+alarm+training+manual', is flagged as a known malicious redirector. The document's structure and the nature of the embedded links suggest an attempt to manipulate search engine rankings or distribute further malicious content, aligning with spearphishing attachment tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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://gettraff.ru/123?keyword=fire+alarm+training+manual In PDF document text
    • https://site-1036826.mozfiles.com/files/1036826/27978529041.pdfIn PDF document text
    • https://site-1036929.mozfiles.com/files/1036929/kobemewarerituzigadafuti.pdfIn PDF document text
    • https://site-1039597.mozfiles.com/files/1039597/43846788974.pdfIn PDF document text
    • https://site-1039772.mozfiles.com/files/1039772/tawabov.pdfIn PDF document text
    • https://site-1043165.mozfiles.com/files/1043165/logokadaxatedupigo.pdfIn PDF document text
    • https://fodezamu.weebly.com/uploads/1/3/1/4/131407453/zuvekazabuz-topofelo-gupolekodojavo-ponabiloxe.pdfIn PDF document text
    • https://genigudepa.weebly.com/uploads/1/3/1/0/131070712/ff06dfdf.pdfIn PDF document text
    • https://ligofaxudatejot.weebly.com/uploads/1/3/0/7/130739538/nidifoxumerirejepo.pdfIn PDF document text
    • https://topodomero.weebly.com/uploads/1/3/2/6/132696018/94079.pdfIn PDF document text
    • https://tejigenunonim.weebly.com/uploads/1/3/0/8/130813632/737298.pdfIn PDF document text
    • https://xijonezamo.weebly.com/uploads/1/3/1/4/131407630/ebcf03411c1f82c.pdfIn PDF document text
    • https://xedaliwim.weebly.com/uploads/1/3/1/4/131454603/gufawoj.pdfIn PDF document text
    • https://tejigenunonim.weebly.com/uploads/1/3/0/8/130813632/0e7825e7c8476.pdfIn PDF document text
    • https://guwomenod.weebly.com/uploads/1/3/0/8/130873843/2a5b38eef3430.pdfIn PDF document text
    • https://fijojonibiw.weebly.com/uploads/1/3/2/6/132681787/wirexanusir.pdfIn PDF document text
    • https://javezevefumutew.weebly.com/uploads/1/3/2/7/132740470/pudokigoweweg_fejokusek_samiforitupavip.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/8ee05990-470b-431e-8f01-afcd2f7ad595/21354982521.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5d5a391d-fd3e-4f12-b319-56ba43897370/72458755678.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_off0000750e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x750E 4780 bytes
SHA-256: 3779f307087d8de36302f6a7a437e9f8b25d078ab07fa9e20ac69a47a483baf0
font_01_sfnt_off00008532.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8532 10428 bytes
SHA-256: 0b4c3c5b180262a4c53617c916575235068b2e74a18c2981fa9809427952c2f5

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