Malicious PDF — malware analysis report

Static analysis result for SHA-256 6fa13907de0ed1a8…

MALICIOUS

PDF

52.6 KB Created: 2020-08-21 14:15:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f14e1656f01f3c9324aa4a445e0a2909 SHA-1: 1f6f2d4c27790140acada0566325141755c6ea09 SHA-256: 6fa13907de0ed1a8cc87cef26e30cc8482306b7d2bd4e4a5f51f242d53d7b8b7
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link to a known malicious redirector, ttraff.cc, disguised with a lure about a free webcam recorder. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK confirms this, and the ML classifier strongly indicates maliciousness. While no scripts were directly extracted, the PDF structure and embedded links suggest an attempt to redirect the user to malicious content, likely for phishing or malware distribution.

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=best+webcam+video+recorder+free
    • http://files.auntiejaniceentertainment.com/uploads/1/3/2/7/132740892/nesesuzo.pdf
    • http://files.coastnuflow.com.au/uploads/1/3/1/6/131636990/doxotulifuvaloxadumi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/7147/9709/files/vajasekevevosi.pdf
    • https://cdn.shopify.com/s/files/1/0431/7007/0687/files/30042545922.pdf
    • https://cdn.shopify.com/s/files/1/0427/9812/1119/files/gaguwibiwepaj.pdf
    • https://cdn.shopify.com/s/files/1/0430/8090/8951/files/dixolozega.pdf
    • https://cdn.shopify.com/s/files/1/0430/3182/2485/files/caramelization_process.pdf
    • https://cdn.shopify.com/s/files/1/0431/6263/2360/files/disewofu.pdf
    • https://cdn.shopify.com/s/files/1/0428/7057/1174/files/52623669138.pdf
    • https://cdn.shopify.com/s/files/1/0435/5401/3336/files/94593810961.pdf
    • https://cdn.shopify.com/s/files/1/0432/7342/0965/files/gilujetuk.pdf
    • https://cdn.shopify.com/s/files/1/0433/9249/9877/files/6587201871.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008f34.bin
25bf919a0b22116f50c7450e872fa111db1caa39bc9deb27b712fc5be02e971a
pdf-font-stream PDF embedded font (sfnt) at offset 0x8F34 5476 bytes
font_01_sfnt_off0000a1d0.bin
f473ff5ac038773a77e1e24c77a01b6e00f6e9e6e927f099e76e63a0ff7104d8
pdf-font-stream PDF embedded font (sfnt) at offset 0xA1D0 10452 bytes