Malicious PDF — malware analysis report

Static analysis result for SHA-256 9dbeec67aafafc1a…

MALICIOUS

PDF

35.4 KB Created: 2020-08-02 09:40:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f40e96ba4e8eacdb2e62483a5876278f SHA-1: e6b2e4907d4a3089e0d7126f85da4bea9d48b36b SHA-256: 9dbeec67aafafc1a9bdee7b181692e314fc026d9adfa6734b7a84bb5b2fb0ede
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a mass of external links, many pointing to PDF files hosted on various domains, which is indicative of a link farm for SEO manipulation or to obscure malicious destinations. One critical heuristic identified a link to a known malicious redirector at `https://ttraff.ru/pify?keyword=tracker+boat+manuals`. The ML classifier strongly supports the malicious verdict. No scripts were extracted, and the document body is heavily obfuscated, but the presence of the malicious redirector and the link farm strategy are sufficient indicators of malicious intent.

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 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.
  • 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.ru/pify?keyword=tracker+boat+manuals
    • http://files.dance4joy.info/uploads/1/3/1/4/131406149/luwopigajeruwoko.pdf
    • http://files.fbcclarion.com/uploads/1/3/0/8/130813357/vowexesoralok-tololiladem-xumonale-bebegak.pdf
    • http://files.crewprofiles.com/uploads/1/3/1/3/131379919/2876127f.pdf
    • http://files.911bodyresq.com/uploads/1/3/0/7/130776118/natarudul-wasawebi-pifag-nisaneneduk.pdf
    • https://cdn.shopify.com/s/files/1/0431/4536/3616/files/17084859963.pdf
    • https://cdn.shopify.com/s/files/1/0432/4638/7367/files/84792303260.pdf
    • https://cdn.shopify.com/s/files/1/0428/8466/1414/files/venomous_fishes_pdf.pdf
    • https://cdn.shopify.com/s/files/1/0432/3537/7307/files/tofipow.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/romiket.pdf
    • https://cdn.shopify.com/s/files/1/0431/7567/4012/files/reading_and_writing_2.pdf
    • https://cdn.shopify.com/s/files/1/0428/1411/1903/files/21293699602.pdf
    • https://cdn.shopify.com/s/files/1/0428/8351/4527/files/35566296208.pdf
    • https://cdn.shopify.com/s/files/1/0432/0028/2783/files/96640549886.pdf
    • https://cdn.shopify.com/s/files/1/0435/0961/2712/files/56130657473.pdf
    • https://cdn.shopify.com/s/files/1/0430/9683/4212/files/zudojodusikapiwakejujiv.pdf
    • https://cdn.shopify.com/s/files/1/0431/3009/3728/files/telijo.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004cb1.bin
d9506539718bca327fe1c6c74145f9c216cbc7990b395205a99693513b30e0ac		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4CB1 5100 bytes
font_01_sfnt_off00005df1.bin
1dca66705088049f41b3147bb07292f7beb1f74510d3b9ca2a5b7379fed9790e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5DF1 10220 bytes

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