Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8aae57b0d406f4b…

MALICIOUS

PDF

50.4 KB Created: 2020-09-02 08:38:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8abf0f84f9ff32c8ac8979657a4522ce SHA-1: cd09b02c9e48a925dc2891c1e16c8a0b900e2ece SHA-256: e8aae57b0d406f4b157bbed054dc6412690a0ef7854d1f1bc5067d9fb44078ed
120 Risk Score

Malware Insights

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

The PDF file contains a critical heuristic firing indicating it links to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains the URL that triggered this finding. The presence of a large number of external PDF links, many hosted on cdn.shopify.com, suggests a link farm or SEO poisoning tactic to distribute the malicious URL.

Heuristics 3

  • 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.
  • 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/wix?keyword=5th+grade+my+math+book+pdf
    • https://cdn.shopify.com/s/files/1/0435/3074/8055/files/kutugi.pdf
    • https://cdn.shopify.com/s/files/1/0431/0630/4153/files/cambio_climatico_causas_y_posibles_efectos.pdf
    • https://cdn.shopify.com/s/files/1/0433/8565/1358/files/65485638531.pdf
    • https://cdn.shopify.com/s/files/1/0429/1313/6799/files/ginakibo.pdf
    • https://cdn.shopify.com/s/files/1/0429/4184/1571/files/89232922192.pdf
    • https://static.usrfiles.com/ugd/9757e7_9062a8a160024b65996562082403e0a6.pdf
    • https://static.usrfiles.com/ugd/735424_549cf71da68a4bb28553dca768372c2c.pdf
    • https://cdn.shopify.com/s/files/1/0433/3161/6923/files/5827341769.pdf
    • https://cdn.shopify.com/s/files/1/0439/8999/1582/files/6735807564.pdf
    • https://cdn.shopify.com/s/files/1/0427/8150/7740/files/duduw.pdf
    • https://cdn.shopify.com/s/files/1/0433/8266/9475/files/94207989602.pdf
    • https://cdn.shopify.com/s/files/1/0432/0316/6369/files/momunugesoliviz.pdf
    • https://cdn.shopify.com/s/files/1/0434/4355/2412/files/39459195858.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_off0000866b.bin
914d38f4fffe2e20d1207ac233b470046fae7f6921d5a5b297a94a28d17b46f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x866B 5580 bytes
font_01_sfnt_off00009945.bin
4cb5e1daca7cfa731c31b8ec6e8a91a0f95b5d81563269f710dfed487a4a816c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9945 10528 bytes

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