Malicious PDF — malware analysis report

Static analysis result for SHA-256 195dc7c8479a17a0…

MALICIOUS

PDF

48.4 KB Created: 2020-08-31 08:58:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4bd9c081710d9c46b80fae3dbb8b694b SHA-1: b62c3f440c2787daaeb8cf44ca75cd1ce9d2f51e SHA-256: 195dc7c8479a17a091623b00ca62b5c716f0c83274e6192c8907269ca33b141e
154 Risk Score

Malware Insights

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

The PDF contains numerous links, including one pointing to a known malicious redirector at 'ttraff.com'. The document body, though heavily obfuscated, contains text related to 'Essentials of econometrics 4th editi' and the malicious URL, suggesting a lure to a phishing or malware distribution site. The presence of embedded URLs and the ML classifier's high confidence indicate malicious intent.

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=essentials+of+econometrics+4th+editi
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/6717/9165/files/susotetabevake.pdf
    • https://cdn.shopify.com/s/files/1/0433/6985/7176/files/75448881689.pdf
    • https://cdn.shopify.com/s/files/1/0431/6941/5327/files/xem_phim_sex_phim_trc_tuyn.pdf
    • https://cdn.shopify.com/s/files/1/0431/5847/0822/files/autocad_3d_window_blocks_free.pdf
    • https://cdn.shopify.com/s/files/1/0428/2174/6847/files/34673635905.pdf
    • https://static.usrfiles.com/ugd/33a16d_e5d44719feff4471854018dc92b19d66.pdf
    • https://static.usrfiles.com/ugd/6f58fb_f67bc4c9fdcf494f832050dc9cbc9cc7.pdf
    • https://static.usrfiles.com/ugd/dfb5f8_a3ed8490e94248a8994dd9ce18ec2107.pdf
    • https://static.usrfiles.com/ugd/b8c837_fb835e4e5b2b4850a9dce70c08322263.pdf
    • https://static.usrfiles.com/ugd/086daf_37827e67fdee4e1a9d85afe4250eca7a.pdf
    • https://static.usrfiles.com/ugd/d5415a_ea1a41bb800d4463a5eac9b49e46a9d1.pdf
    • https://cdn.shopify.com/s/files/1/0429/8765/1235/files/fajofanela.pdf
    • https://cdn.shopify.com/s/files/1/0440/0496/6565/files/5472686092.pdf
    • https://cdn.shopify.com/s/files/1/0437/2873/2314/files/columbus_oh_police_reports_online.pdf
    • https://cdn.shopify.com/s/files/1/0431/8350/5570/files/xuxiji.pdf
    • https://cdn.shopify.com/s/files/1/0432/5995/3312/files/19404233378.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_off00007a93.bin
e13b89c34dd52a0cc6cf8e135658543e83720f7dc786c0182d35578605793813
pdf-font-stream PDF embedded font (sfnt) at offset 0x7A93 5308 bytes
font_01_sfnt_off00008c71.bin
1ceff0b6bdb5448a640791de7ee36ad612c8f0af1ac0e286d6085bedd1bd762e
pdf-font-stream PDF embedded font (sfnt) at offset 0x8C71 12356 bytes