Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f23690191a9c7ca…

MALICIOUS

PDF

41.1 KB Created: 2020-08-21 23:30:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b51194ad9f987bf4f40dac1954b2a07e SHA-1: f006d141fac3b39f25a5ff7e9845b4f4d39e0234 SHA-256: 2f23690191a9c7ca4c667b54b0a9d127ee70e6c3bb4c8dde3baac13875f08558
150 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, with a critical heuristic firing for a malicious redirector. The document body is heavily obfuscated, but the presence of the URL 'https://ttraff.ru/pify?keyword=allstar+performance+heated+tire+groover' and numerous other links to external PDFs suggests a link farm or SEO manipulation tactic. The ML classifier also strongly indicated maliciousness.

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/pify?keyword=allstar+performance+heated+tire+groover
    • http://files.spirithorsekingsburg.org/uploads/1/3/2/6/132696233/12849.pdf
    • http://kijiv.rockwallmaids.com/uploads/1/3/1/4/131437812/jananuje-kipanisujivol-bomopewe-kuwoj.pdf
    • http://digexer.drdom.com.au/uploads/1/3/1/3/131379179/xoxamuwab.pdf
    • https://cdn.shopify.com/s/files/1/0432/7378/1411/files/servel_gas_refrigerator.pdf
    • https://cdn.shopify.com/s/files/1/0434/7654/9798/files/upper_urinary_tract_infection_treatment_guidelines.pdf
    • https://cdn.shopify.com/s/files/1/0440/3704/6422/files/practical_aviation_security_predicting_and_preventing_future_threats.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/31321710084.pdf
    • https://cdn.shopify.com/s/files/1/0439/4817/9611/files/pdf_reader_portable.pdf
    • https://cdn.shopify.com/s/files/1/0439/3569/5016/files/valquirias_paulo_coelho_gratis.pdf
    • https://cdn.shopify.com/s/files/1/0437/0428/7383/files/wukon.pdf
    • https://cdn.shopify.com/s/files/1/0431/1734/6965/files/62410824685.pdf
    • https://cdn.shopify.com/s/files/1/0433/2093/4558/files/avenant_au_contrat_de_travail__dure_indtermine.pdf
    • https://cdn.shopify.com/s/files/1/0435/3127/2346/files/pezidewujidivalata.pdf
    • https://cdn.shopify.com/s/files/1/0430/4535/5682/files/90321616057.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_off000053b1.bin
c19d026d1ef11d34814c73c5960ab91b596580cecf954a983fe682accc5df53a
pdf-font-stream PDF embedded font (sfnt) at offset 0x53B1 5408 bytes
font_01_sfnt_off000065e5.bin
85a3f94b69b51c70ff1df269f35e322c832942948fa4013241511bea09c9251e
pdf-font-stream PDF embedded font (sfnt) at offset 0x65E5 10460 bytes
font_02_sfnt_off0000896f.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3
pdf-font-stream PDF embedded font (sfnt) at offset 0x896F 4324 bytes