Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1dff2558834bda0…

MALICIOUS

PDF

42.5 KB Created: 2020-08-31 20:56:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 357bdc2ce8e25e77ea5124569265c915 SHA-1: c354d84800fa36c397fd528bb3b00061507771d4 SHA-256: c1dff2558834bda05621d68c4a0a4b6b9e7c57fc5e1468f600096f33a707b50b
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF file contains a link to a known malicious redirector, disguised with a keyword related to a car performance package. This suggests a phishing or scam attempt, likely aiming to direct the user to a malicious website. The ML classifier strongly flagged this PDF as malicious, and the presence of numerous embedded links, many pointing to Shopify domains, indicates a link farm strategy. No scripts were extracted, but the primary malicious behavior is the redirection to the ttraff.link URL.

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.link/wix?keyword=2018+chevy+tahoe+rst+performance+package
    • https://static.usrfiles.com/ugd/0e2875_9b8e21a5df5040ccad61e0168010ce01.pdf
    • https://static.usrfiles.com/ugd/b8c837_5a0b90329eae4c639336662e90f90bb4.pdf
    • https://static.usrfiles.com/ugd/7d1dc9_19f2e7226bc84e0587146c0327adfdf6.pdf
    • https://cdn.shopify.com/s/files/1/0437/6284/3797/files/39969883277.pdf
    • https://cdn.shopify.com/s/files/1/0431/8127/7345/files/gemosuxuzipafog.pdf
    • https://cdn.shopify.com/s/files/1/0433/0985/8969/files/23546259554.pdf
    • https://cdn.shopify.com/s/files/1/0434/0708/1630/files/7845963369.pdf
    • https://cdn.shopify.com/s/files/1/0430/8451/3429/files/47582430912.pdf
    • https://cdn.shopify.com/s/files/1/0432/3000/3358/files/12th_finance_commission_report.pdf
    • https://cdn.shopify.com/s/files/1/0431/9445/0078/files/vekirawafevib.pdf
    • https://cdn.shopify.com/s/files/1/0433/7077/4677/files/viwuwoditidu.pdf
    • https://cdn.shopify.com/s/files/1/0430/7487/9642/files/endocrine_therapy_breast_cancer_guidelines.pdf
    • https://cdn.shopify.com/s/files/1/0428/3521/4503/files/pogutamasanariduse.pdf
    • https://cdn.shopify.com/s/files/1/0434/2287/5797/files/collocation_verbs_adjectives_prepositions.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_off00006519.bin
df2e9f579900d161dda654fb64691f5ff09f41cc7f0d5ec3140da4d0e71be05c
pdf-font-stream PDF embedded font (sfnt) at offset 0x6519 6048 bytes
font_01_sfnt_off0000799a.bin
a5e152a9397e2d2708165493679f80cb7777dcbc0707c6e351c448558e80f406
pdf-font-stream PDF embedded font (sfnt) at offset 0x799A 10316 bytes