Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c6dbed3740bea50…

MALICIOUS

PDF

75.5 KB Created: 2020-08-29 16:24:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dc554373b87b0c5f4ca4a0addfb09a1a SHA-1: 0cb85b74829b2d4c9c55c942d1c19b33e46fcd02 SHA-256: 4c6dbed3740bea50865b25723c16032c01de991ba06eb6921737a942cf738a8e
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'ttraff.com', which is used in conjunction with a link farm strategy. The document body, though heavily obfuscated, contains the URL 'https://ttraff.com/wix?keyword=basic+electronic+projects+pdf+downlo', suggesting a lure for users searching for electronic projects. The presence of numerous external links, many hosted on 'cdn.shopify.com', indicates a link farm designed to improve search engine ranking and distribute traffic to malicious sites.

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.com/wix?keyword=basic+electronic+projects+pdf+downlo
    • https://static.usrfiles.com/ugd/b8c837_09df41dc88e24c8cb260ba7435897a25.pdf
    • https://static.usrfiles.com/ugd/b8c837_3837437e7d25421aab3b50b912a17539.pdf
    • https://static.usrfiles.com/ugd/87b9a8_9cc656e04243427eb891a02e648d0715.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/zexula.pdf
    • https://cdn.shopify.com/s/files/1/0435/1534/7103/files/xerikimizuxozapobof.pdf
    • https://cdn.shopify.com/s/files/1/0431/8684/7905/files/xavomupevawalewipuj.pdf
    • https://cdn.shopify.com/s/files/1/0437/4937/6149/files/fipuletasiwedisumuzatifa.pdf
    • https://cdn.shopify.com/s/files/1/0438/4292/8790/files/deewanapan_bhojpuri_movie_video_3gp.pdf
    • https://cdn.shopify.com/s/files/1/0444/4943/1719/files/50313415045.pdf
    • https://cdn.shopify.com/s/files/1/0428/8223/6583/files/anglais_francais_traduction.pdf
    • https://cdn.shopify.com/s/files/1/0438/3404/8669/files/vegunakotuxepunozaba.pdf
    • https://static.usrfiles.com/ugd/b8c837_5d9b2999882f456c9cc369cb58fe5cdd.pdf
    • https://static.usrfiles.com/ugd/b8c837_559195fe310343769ccc0ecd72120be9.pdf
    • https://static.usrfiles.com/ugd/b8c837_5bc0987d876a49da86f1f0a1c43d0539.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_off0000ec3f.bin
c91599840a5ffd76efecebf4dca707550e3004d9bb6a3fc73cec0f779bf9ce2b
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC3F 5368 bytes
font_01_sfnt_off0000fe98.bin
7b5ea6ed2b85e052af97627f33035ba4b6dc109b6e713424feb49df88b655a9d
pdf-font-stream PDF embedded font (sfnt) at offset 0xFE98 10032 bytes