Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5251bd2bddfcb1d…

MALICIOUS

PDF

39.9 KB Created: 2020-07-23 16:38:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e5d09e5bbc8e13e8e07c3cf949b99cf2 SHA-1: 92f4c82a3caf56f5485362be4cd4975436728526 SHA-256: a5251bd2bddfcb1d56d49c12b0e3aa119009929fa044fee263d4b04efaec1b2e
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a high number of embedded links, with one heuristic specifically identifying it as a PDF SEO link farm. One of these links points to a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body is heavily obfuscated and does not provide clear intent, but the volume of links suggests a malicious purpose, likely to manipulate search engine results or redirect users to harmful sites.

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/wb?keyword=basic%20sentence%20structure%20worksheets%20ks1
    • http://files.franrobles.com/uploads/1/3/0/7/130740571/9c1f86.pdf
    • http://files.cityyouthmusic.org/uploads/1/3/1/4/131408204/zitiwomezewedaruj.pdf
    • http://files.fdragflorida.com/uploads/1/3/1/4/131438453/8315535.pdf
    • http://files.thrivingrelationshipslab.com/uploads/1/3/0/8/130873769/babulogaj.pdf
    • http://files.thestylegunn.com/uploads/1/3/0/7/130740589/6492487.pdf
    • http://files.thrivingrelationshipslab.com/uploads/1/3/0/8/1
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/ketotojugidumirazi.pdf
    • https://cdn.shopify.com/s/files/1/0432/7899/1513/files/sapupidaduxelifaze.pdf
    • https://cdn.shopify.com/s/files/1/0434/5970/7037/files/vekilinezeli.pdf
    • https://cdn.shopify.com/s/files/1/0432/8862/5316/files/24800042199.pdf
    • https://cdn.shopify.com/s/files/1/0429/2768/5799/files/93167487106.pdf
    • https://cdn.shopify.com/s/files/1/0432/6942/3269/files/pafurewawanoditerizixofi.pdf
    • https://cdn.shopify.com/s/files/1/0433/8001/5262/files/78488544627.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/digalikerewuxajevukadud.pdf
    • https://cdn.shopify.com/s/files/1/0430/0541/1481/files/77257802375.pdf
    • https://cdn.shopify.com/s/files/1/0430/7235/6509/files/mixiwapiwogagaguvovabamon.pdf
    • https://cdn.shopify.com/s/files/1/0429/6091/2537/files/morumaduboranuvi.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/buxidumex.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_off0000605c.bin
5e3bb7aa0dee5ea6f50c2de754c88c411e5829fc70c68b63c7138af628f109c8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x605C 4992 bytes
font_01_sfnt_off0000715a.bin
f774d70edc06f3fdc7019d661067f8a85a9c45a8bc3d973316f2073be6beda75		 pdf-font-stream PDF embedded font (sfnt) at offset 0x715A 9684 bytes

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