Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ba5942051b6516a…

MALICIOUS

PDF

42.7 KB Created: 2020-08-10 21:09:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0f26d6b88e442ad525d42b0bb3e740a3 SHA-1: 808b1458f7dc247d1e00a8c3d2226657d8add754 SHA-256: 3ba5942051b6516a8ccee81353105e519f508bef7535238dd93bb8ba57717368
152 Risk Score

Malware Insights

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

The PDF was flagged as malicious by a machine learning classifier and contains a critical heuristic indicating it's a redirector link to a known malicious URL. Additionally, it exhibits characteristics of a PDF link farm, with numerous external links embedded within the document. The primary malicious URL identified is https://ttraff.cc/pify?keyword=spanish+words+with+english+translation+pdf. The document body itself is heavily obfuscated and contains many of the same URLs, suggesting a content-generation or SEO-spamming purpose.

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.cc/pify?keyword=spanish+words+with+english+translation+pdf
    • http://ginavuke.magnaliving.com/uploads/1/3/2/7/132740405/7540103.pdf
    • http://files.just-beecause.com/uploads/1/3/0/8/130874213/6ed0e49f.pdf
    • http://jurivaj.mrobinsonmusic.com/uploads/1/3/1/8/131871721/a24b2cadea.pdf
    • https://cdn.shopify.com/s/files/1/0431/3497/6157/files/50919397683.pdf
    • https://cdn.shopify.com/s/files/1/0435/6666/1800/files/pejebivev.pdf
    • https://cdn.shopify.com/s/files/1/0436/2135/1587/files/che_guevara_history_in_tamil.pdf
    • https://cdn.shopify.com/s/files/1/0439/2311/2104/files/wuduketufogote.pdf
    • https://cdn.shopify.com/s/files/1/0432/7194/6398/files/99481876068.pdf
    • https://cdn.shopify.com/s/files/1/0433/5638/9528/files/refug.pdf
    • https://cdn.shopify.com/s/files/1/0436/9619/3686/files/jujinedida.pdf
    • https://cdn.shopify.com/s/files/1/0448/1361/5264/files/pointers_in_cpp.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/97897646990.pdf
    • https://cdn.shopify.com/s/files/1/0431/6892/3799/files/nofanebasefepob.pdf
    • https://cdn.shopify.com/s/files/1/0436/0064/2211/files/41611536534.pdf
    • https://cdn.shopify.com/s/files/1/0436/0932/5730/files/3822533643.pdf
    • https://cdn.shopify.com/s/files/1/0436/0100/2664/files/gibafugewajagifujiruta.pdf
    • https://cdn.shopify.com/s/files/1/0432/1571/6519/files/83514608622.pdf
    • https://cdn.shopify.com/s/files/1/0431/0145/4500/files/suno_na_sangemar_mar_lyrics.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_off000068bb.bin
49b3e81d95bdaa9f0a9409afea690b4396714198fe8863e0dfbce478a6866ffd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x68BB 5500 bytes
font_01_sfnt_off00007b70.bin
78d274222cf9a3c9ca1742feb86c4e0070ecc26e5dfb8c688e385764e5f8a987		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B70 9976 bytes

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