Malicious PDF — malware analysis report

Static analysis result for SHA-256 44a7c09316e7d428…

MALICIOUS

PDF

46.0 KB Created: 2020-08-06 13:08:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cf85412524d06f4361641f9d25181d2f SHA-1: 05e9cdeb6276780d2a10cbe1bc252bdd42a24f25 SHA-256: 44a7c09316e7d4284ad6d2d8146d4c9a983bb0e31f47924b8b3fffeaf3f8b435
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains numerous embedded links, with a critical heuristic firing for a malicious redirector at 'https://ttraff.ru/pify?keyword=3rd+grade+math+review+packet+pdf'. Another critical heuristic identified a PDF link farm, indicating a large number of outbound links, many hosted on Shopify. The ML classifier strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains the same redirector URL and other Shopify-hosted PDF links, suggesting a coordinated effort to lure users to potentially harmful content.

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=3rd+grade+math+review+packet+pdf
    • http://files.hridiancenter.ca/uploads/1/3/1/6/131606275/zenajolegefaxanul.pdf
    • http://files.totsandtumblers.com/uploads/1/3/1/1/131163736/pepokonisenabunog.pdf
    • http://files.emilyjaneart.co.uk/uploads/1/3/1/3/131383444/witimusikeduvugixoga.pdf
    • https://cdn.shopify.com/s/files/1/0429/7113/6154/files/vefit.pdf
    • https://cdn.shopify.com/s/files/1/0434/7697/5768/files/gevuguropalorij.pdf
    • https://cdn.shopify.com/s/files/1/0431/7921/2960/files/gekevasavokagobawetatu.pdf
    • https://cdn.shopify.com/s/files/1/0437/1061/1605/files/90884863656.pdf
    • https://cdn.shopify.com/s/files/1/0434/1753/4629/files/tumunelevipakesipimu.pdf
    • https://cdn.shopify.com/s/files/1/0436/9360/5014/files/mathematical_physics_by_hk_das.pdf
    • https://cdn.shopify.com/s/files/1/0437/9557/9029/files/bible_in_urdu_download.pdf
    • https://cdn.shopify.com/s/files/1/0428/6827/7415/files/rujotojonekalaxafowi.pdf
    • https://cdn.shopify.com/s/files/1/0432/5860/9819/files/96631789991.pdf
    • https://cdn.shopify.com/s/files/1/0440/7679/4021/files/muvok.pdf
    • https://cdn.shopify.com/s/files/1/0429/1110/5191/files/xisexubapiwutunaxalixosu.pdf
    • https://cdn.shopify.com/s/files/1/0439/1705/0008/files/fidowopisiwubogun.pdf
    • https://cdn.shopify.com/s/files/1/0433/5943/6968/files/sudazarezepux.pdf
    • https://cdn.shopify.com/s/files/1/0431/6318/9405/files/how_computers_work.pdf
    • https://cdn.shopify.com/s/files/1/0447/2533/8265/files/software_engineer_cv.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000674b.bin
1cd0ee16cc7943cb33ea9344b52731f04d1755da38b08cfc96140f96b26fde0c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x674B 5216 bytes
font_01_sfnt_off0000791b.bin
5e36d103216c20a4d990530e190c1eab692da1441f75592891bb781143a2f789		 pdf-font-stream PDF embedded font (sfnt) at offset 0x791B 10416 bytes
font_02_sfnt_off00009ccf.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9CCF 4324 bytes

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