Malicious PDF — malware analysis report

Static analysis result for SHA-256 89f65160d4e52d58…

MALICIOUS

PDF

51.9 KB Created: 2020-08-06 06:48:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cecd23b09e670ea56ae796303c9919d2 SHA-1: 6eb8a454e247cb893b46c2b35a1d83ef4a394437 SHA-256: 89f65160d4e52d58687d55bcb80d0f342371f2fcc89e65ff34f9d62f620a8059
152 Risk Score

Malware Insights

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

The PDF file was identified as malicious due to its inclusion of a redirector link to known malicious infrastructure and a large number of embedded links to other PDF files, indicative of a link farm or SEO abuse. The document body contains garbled text but also repeats the malicious URL, suggesting an attempt to disguise or embed the malicious link within the content. No scripts were extracted, and the primary malicious activity appears to be the distribution of links.

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=guida+turistica+della+calabria+pdf
    • http://files.iinternational.net/uploads/1/3/1/0/131071067/tuwivabone.pdf
    • http://files.tiseopaving.com/uploads/1/3/1/4/131408203/bf6b3c.pdf
    • http://files.centralfloridamedium.com/uploads/1/3/1/3/131398461/ramizaz.pdf
    • https://cdn.shopify.com/s/files/1/0428/3406/7615/files/amebiasis_adalah.pdf
    • https://cdn.shopify.com/s/files/1/0432/3983/3763/files/vabazubezabaf.pdf
    • https://cdn.shopify.com/s/files/1/0429/8119/5927/files/kenuvafuruvolop.pdf
    • https://cdn.shopify.com/s/files/1/0437/5045/7505/files/xatevedebotegukepubej.pdf
    • https://cdn.shopify.com/s/files/1/0431/4864/0418/files/gerowuvifudusadunifivuj.pdf
    • https://cdn.shopify.com/s/files/1/0428/0477/3031/files/vepevubipubozamewavedux.pdf
    • https://cdn.shopify.com/s/files/1/0430/8788/8551/files/lelamololugavovetak.pdf
    • https://cdn.shopify.com/s/files/1/0433/3171/5225/files/daliripogima.pdf
    • https://cdn.shopify.com/s/files/1/0437/8374/9781/files/68496909572.pdf
    • https://cdn.shopify.com/s/files/1/0438/4748/3552/files/radewebaxuzevi.pdf
    • https://cdn.shopify.com/s/files/1/0429/4855/9004/files/91165812187.pdf
    • https://cdn.shopify.com/s/files/1/0440/6145/8597/files/vobujurev.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000069e1.bin
3c94110db346d2a30dcaccc55ce562079348ce435390d33c0568ef41cde5d9fc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x69E1 4988 bytes
font_01_sfnt_off00007ae6.bin
7b3f35e15a00fd193240cd4380d6d7b19fe60f65afaa4491e00356dae8931e1e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7AE6 10676 bytes
font_02_sfnt_off00009dad.bin
8c1e3298cb301b6aa2c2aeff0a89e1cafee6626e56d5ffa98ad52a7598c40df9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9DAD 16168 bytes
font_03_sfnt_off0000b2b2.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB2B2 4324 bytes

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