Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba74a1857b12dabd…

MALICIOUS

PDF

34.2 KB Created: 2020-08-06 14:10:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d8fc886d2f3e6d0330ea3ed068ca2960 SHA-1: b551812ad4d60bf62cd757931b127cd1eca2e997 SHA-256: ba74a1857b12dabd914b777ac7b1e65a45600b8c9d5161257e954f92eb5d053e
152 Risk Score

Malware Insights

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

The PDF file contains a significant number of embedded links, many pointing to Shopify domains, suggesting a link farm or SEO manipulation tactic. One critical heuristic identified a link to known malicious redirector infrastructure (ttraff.cc), indicating a potential phishing or malware distribution attempt. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the sheer volume of links and the presence of a malicious redirector are strong indicators of malicious intent.

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=ligadura+de+cordon+umbilical+pdf
    • http://files.create-flourish.org/uploads/1/3/0/7/130739836/1569879.pdf
    • http://files.kelownabreastfeedingcafe.com/uploads/1/3/1/4/131483002/zorokusula-dixoberunogafir.pdf
    • http://files.auntyhelenskitchen.com/uploads/1/3/2/6/132681694/bokex.pdf
    • http://files.durhamyouthprograms.org/uploads/1/3/1/3/131383602/biraju.pdf
    • https://cdn.shopify.com/s/files/1/0428/0261/0335/files/vrchat_eye_tracking.pdf
    • https://cdn.shopify.com/s/files/1/0430/5915/1009/files/656530067.pdf
    • https://cdn.shopify.com/s/files/1/0434/7851/5864/files/95640633425.pdf
    • https://cdn.shopify.com/s/files/1/0431/0145/4500/files/gufawedegijilabodopilafe.pdf
    • https://cdn.shopify.com/s/files/1/0433/6277/9295/files/xopugurefezelegilov.pdf
    • https://cdn.shopify.com/s/files/1/0429/0173/3542/files/krav_maga_manual.pdf
    • https://cdn.shopify.com/s/files/1/0436/2944/5273/files/xexire.pdf
    • https://cdn.shopify.com/s/files/1/0434/9440/8352/files/35282858220.pdf
    • https://cdn.shopify.com/s/files/1/0451/3090/7813/files/85685002000.pdf
    • https://cdn.shopify.com/s/files/1/0437/4937/6161/files/pesomeduleramigatemepari.pdf
    • https://cdn.shopify.com/s/files/1/0437/6202/4605/files/telecharger_journal_el_khabar_algerie.pdf
    • https://cdn.shopify.com/s/files/1/0431/7449/4369/files/59212752389.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_off00004a14.bin
86dc9c835bca116e217439e5381e3768d4df581a6d6bedb05062f9dc434bc75c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4A14 5380 bytes
font_01_sfnt_off00005c4f.bin
9e327361a580ba777d97f2288cb85b3a3c39ac5fb754a88f17cbc7b526c7ee33		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5C4F 9260 bytes

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