Malicious PDF — malware analysis report

Static analysis result for SHA-256 985fd6296aa436d9…

MALICIOUS

PDF

62.9 KB Created: 2020-08-11 18:16:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 86282aaabe69e9f49023adf06785fe2b SHA-1: 9b3d50abcb2ba16bfb6f2b0a3db5d158bd5b4352 SHA-256: 985fd6296aa436d9c77e6ecb7ef7d6ef97dfaa587639e722f45c3ed787eabdcf
120 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.ru/pify?keyword=entorno+laboral+saludable+pdf'. It also contains a PDF link farm heuristic, indicating a large number of embedded links, with the first being 'https://cdn.shopify.com/s/files/1/0438/0616/3104/files/bixenedoredu.pdf'. The document body, though heavily obfuscated, contains the same URL as the redirector, suggesting the document's primary purpose is to trick users into visiting this malicious link.

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/pify?keyword=entorno+laboral+saludable+pdf
    • http://sapuvu.bvecpta.com/uploads/1/3/0/8/130814297/9551578.pdf
    • http://woxali.cffilmfest.org/uploads/1/3/0/8/130874493/mejusigojupeme_terapizuriwefug_difaxetukegexu.pdf
    • http://files.nostroviatowriting.com/uploads/1/3/1/4/131453267/47ec52b9deeb491.pdf
    • https://cdn.shopify.com/s/files/1/0438/0616/3104/files/bixenedoredu.pdf
    • https://cdn.shopify.com/s/files/1/0430/5820/0729/files/fefadonuwine.pdf
    • https://cdn.shopify.com/s/files/1/0431/0673/0138/files/26461226423.pdf
    • https://cdn.shopify.com/s/files/1/0431/4175/9138/files/32414178295.pdf
    • https://cdn.shopify.com/s/files/1/0431/3179/7668/files/62909266475.pdf
    • https://cdn.shopify.com/s/files/1/0430/8955/9705/files/pubojexopigokud.pdf
    • https://cdn.shopify.com/s/files/1/0431/6217/3604/files/zimafuvujitov.pdf
    • https://cdn.shopify.com/s/files/1/0431/6807/1836/files/5970019418.pdf
    • https://cdn.shopify.com/s/files/1/0429/1949/3785/files/78512118244.pdf
    • https://cdn.shopify.com/s/files/1/0436/4877/8400/files/pathogenesis_of_angina_pectoris.pdf
    • https://cdn.shopify.com/s/files/1/0430/3300/2145/files/44804837496.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/febipak.pdf
    • https://cdn.shopify.com/s/files/1/0431/9471/2228/files/sejapedutag.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_off0000b5d0.bin
a4edf3a5e4b174fc78fcc73bc92b35abe693871481de06bca3fe20cadbb4d4f6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB5D0 5132 bytes
font_01_sfnt_off0000c74b.bin
002da5507a7bb4389a45ec77c6052abef16101f194e26e26ae4368ed82958d76		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC74B 11676 bytes

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