Malicious PDF — malware analysis report

Static analysis result for SHA-256 e59daa0fa6173b55…

MALICIOUS

PDF

45.3 KB Created: 2020-08-09 14:53:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c80881507d95520751a7e1123682c6dd SHA-1: 77a3a75ca860ba866fb85d9941064024ef72a2b5 SHA-256: e59daa0fa6173b554ea71cdc79fefb54f6dbfb851170fd8a3e9d17a7884ae406
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to Shopify domains, masquerading as academic resources. One critical heuristic identified a link to a known malicious redirector, ttraff.cc, which likely serves as the initial stage for delivering further malicious content. 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.cc/pify?keyword=actuarial+mathematics+for+life+contingent+risks+2nd+edition+pdf
    • http://files.oldportcandyco.com/uploads/1/3/0/8/130815381/3c686a458fa65.pdf
    • http://files.silvercreekcomn.com/uploads/1/3/0/8/130814083/jelew-suporigifu-tukunetabomon-defufusisora.pdf
    • http://files.curiousfleamarket.com/uploads/1/3/1/8/131871643/rusaraxeselorok_zokenexazuxav.pdf
    • https://cdn.shopify.com/s/files/1/0430/0279/0039/files/padimawedagovuju.pdf
    • https://cdn.shopify.com/s/files/1/0434/5105/6285/files/zofiritopevusozunuvelapa.pdf
    • https://cdn.shopify.com/s/files/1/0431/2301/5841/files/votununifojegaxawunagu.pdf
    • https://cdn.shopify.com/s/files/1/0430/0839/3369/files/57849999954.pdf
    • https://cdn.shopify.com/s/files/1/0435/4162/7029/files/cengage_physical_chemistry_part_1.pdf
    • https://cdn.shopify.com/s/files/1/0431/6977/5782/files/49434037146.pdf
    • https://cdn.shopify.com/s/files/1/0436/0096/9890/files/bcs_theory.pdf
    • https://cdn.shopify.com/s/files/1/0437/9980/6113/files/regular_shotgun_gungeon.pdf
    • https://cdn.shopify.com/s/files/1/0434/4928/6817/files/form_i_407_uscis.pdf
    • https://cdn.shopify.com/s/files/1/0435/6761/2063/files/terminal_automation_system.pdf
    • https://cdn.shopify.com/s/files/1/0438/5836/2518/files/importance_of_problem_solving_skills_in_the_workplace.pdf
    • https://cdn.shopify.com/s/files/1/0432/8144/9126/files/5293804543.pdf
    • https://cdn.shopify.com/s/files/1/0430/8313/7178/files/adjective_worksheets_4th_grade.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_off000071db.bin
bea0ea277509390bbff1a6f89adef70322b414160806620f360280fef540aab6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x71DB 5752 bytes
font_01_sfnt_off00008549.bin
649b4b8e575cc9cf70992b43c0bd19500129df0a8a7d63ec4f0ec7e7647654a8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8549 10120 bytes

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