Malicious PDF — malware analysis report

Static analysis result for SHA-256 2db7889d55bb191c…

MALICIOUS

PDF

41.2 KB Created: 2020-08-29 11:38:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1253eb70cdfe6cf7bc867e4e14aa437c SHA-1: d6290a9d91c71f2575000a5a3c95b01480acfc48 SHA-256: 2db7889d55bb191c9a8df9b26302daa1689da13ec63319e0afbc40a0aea7faba
152 Risk Score

Malware Insights

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

The PDF contains a prominent link to 'ttraff.cc' which is flagged as a malicious redirector, disguised with a keyword suggesting a download. The document body, though heavily obfuscated, also contains this URL and other Shopify links, likely part of a link farm to improve search engine ranking for malicious content. The ML classifier strongly indicated maliciousness.

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/wix?keyword=download+kung+fu+panda+1
    • https://cdn.shopify.com/s/files/1/0438/0088/7457/files/67077210852.pdf
    • https://cdn.shopify.com/s/files/1/0437/6009/1287/files/kulelisubikuxone.pdf
    • https://cdn.shopify.com/s/files/1/0454/6310/9790/files/pedavawaro.pdf
    • https://cdn.shopify.com/s/files/1/0431/7554/2950/files/html_file_to_converter_online_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/84574839703.pdf
    • https://static.usrfiles.com/ugd/b8c837_d03c5b973cf44b979260c8ccfe8d9224.pdf
    • https://static.usrfiles.com/ugd/b8c837_1f2ba7c7dd6148fb955195fcd3266268.pdf
    • https://static.usrfiles.com/ugd/b8c837_b417822a35564b03ba660af99120d73e.pdf
    • https://static.usrfiles.com/ugd/b8c837_777f775b845b4d4dacec14420ea13f7f.pdf
    • https://static.usrfiles.com/ugd/b8c837_44b0347737ab4394b3e02defa38c2303.pdf
    • https://static.usrfiles.com/ugd/b8c837_c2cdf11cf77d41e495478a8651f93925.pdf
    • https://static.usrfiles.com/ugd/b8c837_eb7b9ff53afe4665843893c2008d0bbc.pdf
    • https://static.usrfiles.com/ugd/b8c837_360d42865a664558a9187ed25d39b29b.pdf
    • https://cdn.shopify.com/s/files/1/0430/3699/9842/files/first_aid_step_1_2018_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0432/2403/9592/files/dedegikada.pdf
    • https://cdn.shopify.com/s/files/1/0428/9508/1625/files/69689799450.pdf
    • https://cdn.shopify.com/s/files/1/0431/1249/7312/files/28461923510.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_off000062dd.bin
a818c40b9f9fc83749832686966aa4aa888c9d532fc8a71305ee637c78dfc623
pdf-font-stream PDF embedded font (sfnt) at offset 0x62DD 5140 bytes
font_01_sfnt_off00007493.bin
9418efe3703bd6b2bd3eeb123f1fe333ff9461b3a1ec2a51b214419b150c100a
pdf-font-stream PDF embedded font (sfnt) at offset 0x7493 10440 bytes