Malicious PDF — malware analysis report

Static analysis result for SHA-256 906ce54482660e2d…

MALICIOUS

PDF

41.9 KB Created: 2020-08-13 10:44:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a0f8e5ef9f46c2d710e7c56f18dda4ca SHA-1: 378859e268bcd1289b827cb53e4b15cd24f676b6 SHA-256: 906ce54482660e2db99f1266ecf5e74c11cdef22a3b6d2b402c309308c3bd26b
150 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external PDF files, characteristic of a link farm. One prominent URL, https://ttraff.ru/wb?keyword=patellar%20tendonitis%20physical%20therapy%20exercises%20pdf, is flagged as a malicious redirector. The ML classifier also strongly indicates maliciousness. The document body appears to be malformed or heavily obfuscated, but the presence of the redirector URL suggests the primary intent is to lure the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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/wb?keyword=patellar%20tendonitis%20physical%20therapy%20exercises%20pdf
    • http://files.helpaheartcpr.com/uploads/1/3/1/1/131164312/bebekazan.pdf
    • http://files.thevillagehivebakeryandlocalfoodscollective.com/uploads/1/3/1/6/131637881/146546.pdf
    • http://debad.annarbortreeservice.net/uploads/1/3/1/6/131606490/nikitepifemu.pdf
    • http://files.ambitoinmobiliarioltda.com/uploads/1/3/2/3/132303147/9939a0534.pdf
    • https://cdn.shopify.com/s/files/1/0433/4714/8950/files/vobokosinuzusuxeranukus.pdf
    • https://cdn.shopify.com/s/files/1/0449/9639/5166/files/etiologi_marasmus.pdf
    • https://cdn.shopify.com/s/files/1/0432/7378/1408/files/gesalimabegubiperezotofa.pdf
    • https://cdn.shopify.com/s/files/1/0435/2137/6410/files/wipuvalawidatovojalogos.pdf
    • https://cdn.shopify.com/s/files/1/0448/4956/1757/files/delete_blank_page_online.pdf
    • https://cdn.shopify.com/s/files/1/0440/2806/7990/files/zomerekobegexabuxuvab.pdf
    • https://cdn.shopify.com/s/files/1/0434/1386/4604/files/tobawedi.pdf
    • https://cdn.shopify.com/s/files/1/0432/8262/8766/files/banikupaxawuputowoz.pdf
    • https://cdn.shopify.com/s/files/1/0427/9920/2467/files/zubatotupixuvudidomuj.pdf
    • https://cdn.shopify.com/s/files/1/0432/6745/7182/files/28941083050.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_off000064b3.bin
d6888b15c4304d453762d1a8fa59e910c6eacbcdaef8fbe1057eab417a4ea869		 pdf-font-stream PDF embedded font (sfnt) at offset 0x64B3 5412 bytes
font_01_sfnt_off00007718.bin
60c6e341860653c2d848967b2d6c42f33a3f56b3cb7280e258832befd97693e8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7718 10440 bytes

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