Malicious PDF — malware analysis report

Static analysis result for SHA-256 2391cfdc1ac0b3ee…

MALICIOUS

PDF

41.1 KB Created: 2020-11-09 11:35:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 96aabfd0ff0b9878d312dad213ff0ebd SHA-1: dcffbfc592c756da1bb99a19f068593928f71009 SHA-256: 2391cfdc1ac0b3eee561453500d5c0e1c55ca6523989efee522f6944f76c7f91
192 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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?keyword=katie+sunshine+hot In PDF document text
    • https://dolufuweg.weebly.com/uploads/1/3/4/6/134626051/3027269.pdfIn PDF document text
    • https://voxapinave.weebly.com/uploads/1/3/2/7/132740917/94093777cc.pdfIn PDF document text
    • https://lajanasana.weebly.com/uploads/1/3/4/3/134368101/8bfa88591c.pdfIn PDF document text
    • https://zepixufiguw.weebly.com/uploads/1/3/4/1/134108583/5478468.pdfIn PDF document text
    • https://fixabugodorev.weebly.com/uploads/1/3/1/8/131856934/nulet-vumilevibiwun-totagini.pdfIn PDF document text
    • https://besiwalufeg.weebly.com/uploads/1/3/2/6/132696214/mezuber.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383449/normal_5f8caa5a674b3.pdfIn PDF document text
    • https://repafajekojila.weebly.com/uploads/1/3/4/3/134305679/a231c5.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/4f1fa64f-cd1c-4fc8-bd7d-f8d66e86141e/83317048181.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1fdcae53-966e-4853-85fe-94085330504b/13864344058.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4ee94ea0-0a08-46ce-8b32-a010506ef75a/tefodugobagajufufageb.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c81f0d65-b39c-4173-a098-a8f10be4257e/6489924168.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_off0000619a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x619A 4612 bytes
SHA-256: 3563214854c71337272d30933a2f10993e3494878377a590d994d9120b61fb3a
font_01_sfnt_off00007150.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7150 11480 bytes
SHA-256: bbba16fc49c8d699ad6e7ac164ffb3d7918f700574c2223bab433a62df23ac95

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