Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb79cf707ab1fa26…

MALICIOUS

PDF

39.2 KB Created: 2020-08-05 03:09:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ca778198ab8575af2cf39f8b78130556 SHA-1: b5a1d5ac1fe23afea3f5cbd6cd3b544c7be5643d SHA-256: fb79cf707ab1fa26c6e6ae6e7e607939891e5763896c9ae2374069dd61a69eb5
152 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with one specifically pointing to a known malicious redirector infrastructure at 'https://ttraff.ru/pify?keyword=attached+book+pdf+free+download'. This indicates a social engineering attempt to lure users into downloading further malicious content. The document body's text and the presence of numerous links suggest a link farm or SEO poisoning tactic to distribute malware. No scripts were extracted, but the malicious redirection is sufficient evidence 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=attached+book+pdf+free+download
    • http://files.srgaragedoor.com/uploads/1/3/0/7/130739315/kaxojebi.pdf
    • http://kinur.letterstolawyers.com/uploads/1/3/0/7/130775918/wanem_gokozedenadipo_jizudiluzo_kuwevewet.pdf
    • http://rutew.whereintheworldisjenniferlynn.com/uploads/1/3/0/8/130874478/nawopubamivetikup.pdf
    • http://files.jonathanmichaelcyrus.com/uploads/1/3/0/8/130873732/puruxudigilarip.pdf
    • https://cdn.shopify.com/s/files/1/0432/9422/8630/files/nuwaxiwetaga.pdf
    • https://cdn.shopify.com/s/files/1/0432/5762/6792/files/bubenikijoxapuzazipo.pdf
    • https://cdn.shopify.com/s/files/1/0437/7195/3301/files/67005018128.pdf
    • https://cdn.shopify.com/s/files/1/0429/6422/2101/files/53619147982.pdf
    • https://cdn.shopify.com/s/files/1/0434/6583/4658/files/kekegoxel.pdf
    • https://cdn.shopify.com/s/files/1/0430/3519/7602/files/jusawodibofaguzixazemov.pdf
    • https://cdn.shopify.com/s/files/1/0428/8937/9993/files/how_to_see_minecraft_coordinates.pdf
    • https://cdn.shopify.com/s/files/1/0435/6007/5427/files/29436231608.pdf
    • https://cdn.shopify.com/s/files/1/0440/7630/2486/files/11450173701.pdf
    • https://cdn.shopify.com/s/files/1/0430/5004/1495/files/sepuzixekiweke.pdf
    • https://cdn.shopify.com/s/files/1/0432/3042/9346/files/octosniff_cracked_download.pdf
    • https://cdn.shopify.com/s/files/1/0438/4076/6109/files/99815633188.pdf
    • https://cdn.shopify.com/s/files/1/0432/8869/0841/files/rijoko.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_off00005a45.bin
55470d174d6468ad60f70b0d0b6910249184404fa69902d6aff41037fa9370ea		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5A45 5348 bytes
font_01_sfnt_off00006c81.bin
a88f6e2b6da45206014e478b124a5074696a71ee06dc5a4a734e5217276de004		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C81 10344 bytes

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