Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f3cf8e79ace999f…

MALICIOUS

PDF

46.0 KB Created: 2020-08-15 18:44:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d34854a07b8f714b30a83aac23b6da67 SHA-1: e4760e750730fd50cc89ea0f645bf149420447f8 SHA-256: 3f3cf8e79ace999fba841cf15376843ed57a518682ae3d7c0fa28dfbddf28e1b
152 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by a machine learning classifier and contains a large number of embedded links, indicating a link farm. One of the primary links directs to a known malicious redirector, 'ttraff.cc', which likely serves as a gateway to further malicious content or phishing pages. The document body itself is heavily obfuscated and contains the primary malicious URL, suggesting an attempt to lure users into clicking through to a harmful destination.

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.cc/pify?keyword=steam+boiler+performance+curves
    • http://files.oxeyns.com/uploads/1/3/1/8/131856904/bumenajawase_dakareputev.pdf
    • http://files.evangelizeme.org/uploads/1/3/0/7/130738771/939072.pdf
    • http://files.gabriellapetstyle.net/uploads/1/3/1/4/131438509/webip_xasamusevowofu_duzularalonax.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/jatud.pdf
    • https://cdn.shopify.com/s/files/1/0448/0725/8269/files/extended_metaphor_example.pdf
    • https://cdn.shopify.com/s/files/1/0431/2799/6565/files/80420830034.pdf
    • https://cdn.shopify.com/s/files/1/0434/4607/5554/files/200_investment_banking_interview_questions_and_answers.pdf
    • https://cdn.shopify.com/s/files/1/0435/2756/9576/files/73351060170.pdf
    • https://cdn.shopify.com/s/files/1/0430/2556/3801/files/vovuvelokumo.pdf
    • https://cdn.shopify.com/s/files/1/0433/4501/9035/files/6014835301.pdf
    • https://cdn.shopify.com/s/files/1/0439/0758/0072/files/the_economist_6_july_2020.pdf
    • https://cdn.shopify.com/s/files/1/0432/9956/9829/files/govuzenufoxifotuvez.pdf
    • https://cdn.shopify.com/s/files/1/0438/9493/1624/files/52853115830.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_off00006f04.bin
43912e9b1d02846f2db3e08e7979802b3f4bb67c2b4cdbf9b795b4aefc2c029f
pdf-font-stream PDF embedded font (sfnt) at offset 0x6F04 5464 bytes
font_01_sfnt_off00008187.bin
ebeecc6fed05446d845788c6cce6f4fcfd3777f44b0b016a69496779f4043416
pdf-font-stream PDF embedded font (sfnt) at offset 0x8187 12956 bytes