Malicious PDF — malware analysis report

Static analysis result for SHA-256 db24910534db7d0b…

MALICIOUS

PDF

43.3 KB Created: 2020-10-30 23:22:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 58cefed6316b79f89c35a1e04c85ed76 SHA-1: 4aec81565e86bc10315dc508dfc136ab18febc47 SHA-256: db24910534db7d0b4065026cf3c44e705e879f082cc4619ca49c0cc74f078270
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, indicating a link farm designed to drive traffic. One of the embedded URLs, https://ttraff.com/123?keyword=interpersonal+relationships+definition+psychology, is identified as a malicious redirector. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is intended for malicious redirection or exploitation.

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://ttraff.com/123?keyword=interpersonal+relationships+definition+psychology In PDF document text
    • https://lififamofupuge.weebly.com/uploads/1/3/4/3/134317858/920935.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385026/normal_5f916763795a9.pdfIn PDF document text
    • https://dozasasakebo.weebly.com/uploads/1/3/1/1/131164234/jelenofaledif-nunibapikire-noboridezaru-betuzelarimali.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366319/normal_5f8cc5a737d5e.pdfIn PDF document text
    • https://solujokorox.weebly.com/uploads/1/3/4/1/134108712/deginumazek-lekadirupib-bugapusisajola-jikiz.pdfIn PDF document text
    • https://munerotilaxamo.weebly.com/uploads/1/3/4/4/134476206/nixedidevogododewe.pdfIn PDF document text
    • https://papunagaku.weebly.com/uploads/1/3/1/3/131384156/vowavebodujogoje.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375341/normal_5f9c312e6be16.pdfIn PDF document text
    • https://xanuvomapimiv.weebly.com/uploads/1/3/4/3/134342034/boledupuz_ginarimuf_demegerati_rimetafoxono.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/tejuvonixag/equations_in_latex.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/291c3573-c65c-4255-a79b-041198e918eb/vaseturejafuba.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_off0000698c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x698C 5456 bytes
SHA-256: 881cabb569c8397cc7a2387e066c072e32ef87bb6cfd3e8d902a8a5731861b92
font_01_sfnt_off00007c1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7C1D 10468 bytes
SHA-256: 2e8e2db408dea1d0999239eb9cbb161c58220e34a8dfcd797a1d444793f2a836

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