Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc098280a21b2cf0…

MALICIOUS

PDF

56.1 KB Created: 2020-08-10 01:45:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e0de03c3870ae1599c8d8f9ef6b00085 SHA-1: 43366f39b754e2b39bfa249314e7c9c15924e723 SHA-256: bc098280a21b2cf086cbe8f4eec76a9173b49be92175f1912d5ad957069d8070
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many pointing to Shopify domains hosting other PDFs, indicative of a link farm for SEO manipulation. One critical link directs to 'ttraff.ru', a known malicious redirector. The document body, though partially corrupted, contains text related to 'tratamiento de sinusitis aguda en niños pdf' and the malicious redirector URL, suggesting a lure to generate traffic to malicious infrastructure. The ML classifier strongly flagged this PDF as malicious.

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=tratamiento+de+sinusitis+aguda+en+ni%25C3%25B1os+pdf
    • http://files.drumvictoria.com/uploads/1/3/0/7/130775490/bijabijijuru_fewix_rakixonox.pdf
    • http://files.whitemanonline.com/uploads/1/3/2/6/132682883/zogufexil.pdf
    • http://zorajazil.conifercounselingseattle.com/uploads/1/3/1/4/131408027/jitujuturu.pdf
    • http://files.apexhumanperformance.com/uploads/1/3/0/8/130874090/zatasolijesixamotin.pdf
    • https://cdn.shopify.com/s/files/1/0428/9432/7975/files/badegukifebad.pdf
    • https://cdn.shopify.com/s/files/1/0433/9400/7191/files/bikefawaw.pdf
    • https://cdn.shopify.com/s/files/1/0429/0510/8636/files/sukobemevedid.pdf
    • https://cdn.shopify.com/s/files/1/0438/4745/0789/files/waltz_for_debby_guitar.pdf
    • https://cdn.shopify.com/s/files/1/0431/1531/5349/files/guia_ceneval_de_derecho.pdf
    • https://cdn.shopify.com/s/files/1/0441/0081/2952/files/wanikutozaremon.pdf
    • https://cdn.shopify.com/s/files/1/0431/2449/0397/files/barycentre_de_3_points.pdf
    • https://cdn.shopify.com/s/files/1/0432/6352/5026/files/39712975551.pdf
    • https://cdn.shopify.com/s/files/1/0431/5666/8573/files/iliad_robert_fitzgerald.pdf
    • https://cdn.shopify.com/s/files/1/0432/6578/6006/files/65974345990.pdf
    • https://cdn.shopify.com/s/files/1/0435/6633/4111/files/find_cdf_from_matlab.pdf
    • https://cdn.shopify.com/s/files/1/0429/1775/7095/files/45309471777.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_off000098bd.bin
36887066d3b04b060b38391e936ceae3e9491b1151dc72a05c4b75ca683d06bf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x98BD 5488 bytes
font_01_sfnt_off0000ab0e.bin
673f4c8251d7f594a1ba02e9c638f28fcd319f6bf4385f7cd6827eb039c158a6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAB0E 11628 bytes

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