Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa10a0fa70b3a92d…

MALICIOUS

PDF

43.2 KB Created: 2020-08-11 20:22:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: de7f84309e76bacbaf5e180526f4f513 SHA-1: a57fe16c03184f9bb4b5724ff94037612c3ea62d SHA-256: aa10a0fa70b3a92d8eedb89e9c7c0c11160742743cc5b15c821601e5e9bb250e
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing for a malicious redirector. The primary URL, https://ttraff.cc/pify?keyword=formula+of+mean+median+mode+pdf, is identified as a malicious redirector. The document body, though heavily obfuscated, also contains this URL, suggesting the PDF's purpose is to lure users to this malicious site. The ML classifier strongly supports the malicious verdict.

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.cc/pify?keyword=formula+of+mean+median+mode+pdf
    • http://files.inured.org/uploads/1/3/1/4/131438313/94e388f07cf7.pdf
    • http://files.supcoloradosprings.com/uploads/1/3/1/3/131398143/c62090.pdf
    • http://files.beautifulsmilesofbethpage.com/uploads/1/3/2/3/132303043/9203563.pdf
    • http://files.triplecreekkennels.com/uploads/1/3/1/3/131398455/05aefe241ba574.pdf
    • http://files.bacorpseptic.com/uploads/1/3/0/7/130740522/10800721c33167a.pdf
    • https://cdn.shopify.com/s/files/1/0431/9041/9620/files/19604988863.pdf
    • https://cdn.shopify.com/s/files/1/0434/6845/6086/files/tivosebozufaxuvulo.pdf
    • https://cdn.shopify.com/s/files/1/0434/5220/3161/files/a_twist_of_the_wrist_the_motorcycle_roadracers_handbook.pdf
    • https://cdn.shopify.com/s/files/1/0434/9375/2997/files/5314933368.pdf
    • https://cdn.shopify.com/s/files/1/0432/4704/2715/files/circulatory_system_worksheet_grade_6.pdf
    • https://cdn.shopify.com/s/files/1/0441/4432/8856/files/dojigaxedibif.pdf
    • https://cdn.shopify.com/s/files/1/0435/8491/3565/files/72835330496.pdf
    • https://cdn.shopify.com/s/files/1/0428/3337/9487/files/limitations_of_ethnographic_research.pdf
    • https://cdn.shopify.com/s/files/1/0439/3569/5016/files/common_idioms_and_phrases_with_examples.pdf
    • https://cdn.shopify.com/s/files/1/0430/5358/0439/files/53760901738.pdf
    • https://cdn.shopify.com/s/files/1/0434/1969/7310/files/tawenunemekulujuvule.pdf
    • https://cdn.shopify.com/s/files/1/0436/2108/9444/files/2457642155.pdf
    • https://cdn.shopify.com/s/files/1/0431/0892/5602/files/gewosub.pdf
    • https://cdn.shopify.com/s/files/1/0438/4718/8640/files/xodaxobapiworiseta.pdf
    • https://cdn.shopify.com/s/files/1/0430/7006/2754/files/gadibedipafusep.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_off000069bf.bin
eb8754c0cde475cc235e56767952651ccfb34b4aa93f91573b85de873443cf41		 pdf-font-stream PDF embedded font (sfnt) at offset 0x69BF 4964 bytes
font_01_sfnt_off00007a87.bin
1a3423c2e8f8b43805a2aacf5edcd7b33188a10bbf1ca51d38f67a57f7293aed		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A87 10932 bytes

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