Malicious PDF — malware analysis report

Static analysis result for SHA-256 f74bc983ece17096…

MALICIOUS

PDF

56.3 KB Created: 2020-08-05 16:22:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f2f4b36b9605c4f789069414724145d1 SHA-1: 57f3ea9813b2820b59c2e1666b2be72b5dc1b1ba SHA-256: f74bc983ece170966b583912500de9234e2b78ba32099ccf7a26d4d4e4947240
152 Risk Score

Malware Insights

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

The PDF was flagged by a critical heuristic for linking to known malicious redirector infrastructure and for being part of a link farm. The document body contains the URL 'https://ttraff.cc/pify?keyword=medea+euripides+pdf+gredos', which is a known malicious redirector. The presence of numerous other links, many pointing to Shopify domains, suggests a coordinated effort to distribute malicious content or phish users. The ML classifier also strongly indicated maliciousness.

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=medea+euripides+pdf+gredos
    • http://files.tkccv.net/uploads/1/3/1/4/131410009/xerajudopanisa.pdf
    • http://files.orendagametables.org/uploads/1/3/1/6/131606762/degatewenodapelet.pdf
    • http://files.anthamation.com/uploads/1/3/0/7/130776200/6260965.pdf
    • https://cdn.shopify.com/s/files/1/0437/2830/6330/files/pefuzokuneni.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/73121007565.pdf
    • https://cdn.shopify.com/s/files/1/0433/2732/4310/files/12825244265.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/ligumugazawebamupewav.pdf
    • https://cdn.shopify.com/s/files/1/0432/5618/4992/files/42220380236.pdf
    • https://cdn.shopify.com/s/files/1/0433/0474/7168/files/mabegut.pdf
    • https://cdn.shopify.com/s/files/1/0431/0299/4586/files/common_mental_disorders_questionnaire.pdf
    • https://cdn.shopify.com/s/files/1/0436/0981/7251/files/gepabugexerokipe.pdf
    • https://cdn.shopify.com/s/files/1/0431/7839/3749/files/tofexetozifug.pdf
    • https://cdn.shopify.com/s/files/1/0427/6482/8838/files/24982448672.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/siwizobudavegi.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_off000081fc.bin
061a066cd70a4cabce43e758344ed19108842cc0e25b13fc591cb052c6a299e4
pdf-font-stream PDF embedded font (sfnt) at offset 0x81FC 4880 bytes
font_01_sfnt_off000092aa.bin
ce01863d82bde158ae98297109aef5662913ead1a86539514dd47827ece37c36
pdf-font-stream PDF embedded font (sfnt) at offset 0x92AA 17824 bytes
font_02_sfnt_off0000c670.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3
pdf-font-stream PDF embedded font (sfnt) at offset 0xC670 4324 bytes