Malicious PDF — malware analysis report

Static analysis result for SHA-256 026fc5644330be96…

MALICIOUS

PDF

68.9 KB Created: 2020-08-09 02:43:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0fcdcd223e043d75ce3164780d6d4a30 SHA-1: 482c933a359fbf4582bb370765bd29fe36b6930a SHA-256: 026fc5644330be96943fad5af79cf2b3013aa032e088554158790d71f90f77ef
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded links, many of which point to Shopify domains hosting other PDFs, suggesting a link farm or SEO poisoning tactic. One prominent link directs to a known malicious redirector, indicating an attempt to lead the user to a harmful site. The ML classifier strongly supports the malicious nature of this PDF.

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.com/wb?keyword=phase%20lead%20and%20lag%20compensator%20pdf
    • http://files.computerscpr.com/uploads/1/3/2/7/132740860/xubujolodosetejokuv.pdf
    • http://files.partnersinhopeusa.org/uploads/1/3/1/3/131384679/gajujogukibegoget.pdf
    • http://files.oakgrovechristianschool.com/uploads/1/3/2/6/132681322/wonenuketodoriw.pdf
    • http://files.bethelquesnel.net/uploads/1/3/1/6/131606262/1468909.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/6525/2771/files/dnd_5e_druid_circle_of_the_moon.pdf
    • https://cdn.shopify.com/s/files/1/0434/4473/2065/files/kifagemezovitigulo.pdf
    • https://cdn.shopify.com/s/files/1/0430/3791/7345/files/3298920869.pdf
    • https://cdn.shopify.com/s/files/1/0430/9362/2935/files/32236510721.pdf
    • https://cdn.shopify.com/s/files/1/0432/8236/6629/files/nuguxoteteniguv.pdf
    • https://cdn.shopify.com/s/files/1/0435/4070/9527/files/skb_ps_25_manual.pdf
    • https://cdn.shopify.com/s/files/1/0433/6975/8874/files/kozopipod.pdf
    • https://cdn.shopify.com/s/files/1/0433/4606/7605/files/77612852695.pdf
    • https://cdn.shopify.com/s/files/1/0430/9801/3863/files/toxina_botulinica_estrabismo.pdf
    • https://cdn.shopify.com/s/files/1/0439/0669/5320/files/38725266080.pdf
    • https://cdn.shopify.com/s/files/1/0429/2476/9436/files/84881366070.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/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b656.bin
945bfbaba5edadfcc2554032babddb94901b0773d255dee479de72b69521dbd9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB656 5568 bytes
font_01_sfnt_off0000c919.bin
8f5cd6f2c3b106d077ba9ce40d7d4828dbf0f02d98c7341203647e4317fc2370		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC919 11832 bytes
font_02_sfnt_off0000f14e.bin
275d0ef8f619a30f75d5b67021c85ffe51dbf44d82a44ecb2d07128ff93f9399		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF14E 16112 bytes

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