Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a16e9b204ea5efc…

MALICIOUS

PDF

40.1 KB Created: 2020-08-19 08:48:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 136dd683e8a219cdce214e305f79cb9f SHA-1: f41e0f5c74b73961bcc439ce0ffa37cbbed89da3 SHA-256: 5a16e9b204ea5efcd5494ee70ece00f32304887a56802efe866df9152bd6ecaf
152 Risk Score

Malware Insights

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

The PDF file contains a significant number of embedded links, with one identified as a malicious redirector. The presence of a large link farm suggests an attempt to manipulate search engine results or distribute malicious content through seemingly benign documents. The ML classifier also strongly indicated maliciousness.

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=wind+chimes+sound+effects+free
    • http://files.greenchairpictures.com/uploads/1/3/1/4/131453897/modagovum.pdf
    • http://files.crystal-river-healing.com/uploads/1/3/0/8/130813982/9a877e15c77612.pdf
    • http://mobojoza.nikdhar.org/uploads/1/3/1/1/131163599/a55080.pdf
    • http://mufej.evaatkinson.com/uploads/1/3/2/7/132712323/7a71d.pdf
    • https://cdn.shopify.com/s/files/1/0433/1575/7214/files/narig.pdf
    • https://cdn.shopify.com/s/files/1/0429/0671/4268/files/auxiliaire_etre_et_avoir_cours.pdf
    • https://cdn.shopify.com/s/files/1/0437/4154/4599/files/ww_wimp_com.pdf
    • https://cdn.shopify.com/s/files/1/0437/9561/1809/files/dragon_s_dogma_cursed_carving.pdf
    • https://cdn.shopify.com/s/files/1/0431/0843/4081/files/pemeboworoxogiri.pdf
    • https://cdn.shopify.com/s/files/1/0435/5453/7624/files/asmaul_husna_a4.pdf
    • https://cdn.shopify.com/s/files/1/0437/7152/7325/files/nunogijuxutonijafemepojel.pdf
    • https://cdn.shopify.com/s/files/1/0428/3033/2060/files/65354798479.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_off000057f2.bin
e122a7004f23819ab72e08dffc1d125d1fcb01024d4a313105020b460ef93015		 pdf-font-stream PDF embedded font (sfnt) at offset 0x57F2 5032 bytes
font_01_sfnt_off000068ea.bin
319c34227e413caab2363a74934a5d7c8c39e45e95ed950f18ebcf5e73d6bb1c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x68EA 13408 bytes

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