Malicious PDF — malware analysis report

Static analysis result for SHA-256 ceff0b908768be94…

MALICIOUS

PDF

45.2 KB Created: 2020-08-04 19:46:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 090f7eb4c049b675b07fcc62e7784d41 SHA-1: e34dea0a2f003572f95d6f52527e481d80d6e182 SHA-256: ceff0b908768be94d433acec8a055ea2c043b6164caa03efbb742a3c960dc779
152 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.ru, which is disguised with a keyword relevant to construction documents. The document also hosts a large number of external PDF links, many pointing to Shopify domains, suggesting a link farm or SEO poisoning tactic. The ML classifier strongly indicated maliciousness. The primary attack vector appears to be directing users to malicious infrastructure via a deceptive link.

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=building+materials+and+construction+pdf+notes
    • http://files.ottawatalentagency.com/uploads/1/3/1/3/131379594/xoweromekek-xomebifob-sinefav.pdf
    • http://paduvo.cakesespecially.com/uploads/1/3/2/7/132712615/470f60c3dbaaa.pdf
    • http://files.ccfreelancejournalist.co.uk/uploads/1/3/1/4/131407668/477688.pdf
    • https://cdn.shopify.com/s/files/1/0432/2554/6912/files/3011160813.pdf
    • https://cdn.shopify.com/s/files/1/0431/2875/0241/files/wedel.pdf
    • https://cdn.shopify.com/s/files/1/0431/3012/6496/files/wajeva.pdf
    • https://cdn.shopify.com/s/files/1/0433/1552/7833/files/wawewibixezaxanapizito.pdf
    • https://cdn.shopify.com/s/files/1/0435/0833/4744/files/dire_maul_guide.pdf
    • https://cdn.shopify.com/s/files/1/0430/4830/4797/files/95607801418.pdf
    • https://cdn.shopify.com/s/files/1/0435/7111/8235/files/46676713685.pdf
    • https://cdn.shopify.com/s/files/1/0432/6257/4750/files/21182585659.pdf
    • https://cdn.shopify.com/s/files/1/0432/3255/9263/files/troy_stetina.pdf
    • https://cdn.shopify.com/s/files/1/0433/0458/3318/files/27220236473.pdf
    • https://cdn.shopify.com/s/files/1/0437/1772/2280/files/dojedoxoxotepefepiva.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/87294954422.pdf
    • https://cdn.shopify.com/s/files/1/0437/8922/2037/files/zolodikewafisevupozogav.pdf
    • https://cdn.shopify.com/s/files/1/0428/3334/6719/files/41192826529.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_off00006557.bin
72d2e29f3327ae43e8ef4bd00dbf6776790961655674479815d56fc0744de04a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6557 5404 bytes
font_01_sfnt_off00007791.bin
8cdd1c8914b13c55438592e43df9e87e26424e89a69a5f826f65a2140ba0921e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7791 9936 bytes
font_02_sfnt_off00009994.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9994 4324 bytes

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