Malicious PDF — malware analysis report

Static analysis result for SHA-256 016c139aeeb38793…

MALICIOUS

PDF

38.3 KB Created: 2020-08-31 03:57:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4d0696eb373f6442dce749c04bc5800b SHA-1: 1717580f6fac29efd1b9238687d9e42add44ae48 SHA-256: 016c139aeeb38793cdb6a09c2ae547fadb6918e7180fc93086b439077f9d21fa
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, including one pointing to a known malicious redirector at 'ttraff.com'. The document body, though heavily obfuscated, contains text related to book downloads and the malicious URL, suggesting a lure for users seeking content. The ML classifier also 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.com/wix?keyword=the+duke+and+i+julia+quinn+pdf+free+download
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/2151/6448/files/advantages_and_disadvantages_of_internet_in_tamil.pdf
    • https://cdn.shopify.com/s/files/1/0430/0157/7625/files/81293533135.pdf
    • https://cdn.shopify.com/s/files/1/0435/1744/4264/files/10071834900.pdf
    • https://cdn.shopify.com/s/files/1/0433/3702/3641/files/install_python_on_mac.pdf
    • https://cdn.shopify.com/s/files/1/0431/9097/6673/files/88939779681.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/34707652888.pdf
    • https://static.usrfiles.com/ugd/b8c837_07afa77f3e634e66b134aafe6a3cc6c7.pdf
    • https://static.usrfiles.com/ugd/fb83f1_d9fdce7d5a944244bc792322fb37ffa4.pdf
    • https://static.usrfiles.com/ugd/b8c837_58c7cd9e7fb84697a096215b1eac9c71.pdf
    • https://static.usrfiles.com/ugd/b8c837_2100d23ced5a494985e5751a87342560.pdf
    • https://static.usrfiles.com/ugd/384ea4_310f01a0bbcd4e25b5351b722b6445f0.pdf
    • https://static.usrfiles.com/ugd/b8c837_2d77b55810b44e66b0a011550b59a5db.pdf
    • https://static.usrfiles.com/ugd/b8c837_759cd68447144ebea5532268beb08e30.pdf
    • https://static.usrfiles.com/ugd/1be480_0da0a08b764744efabbb46390e0649aa.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_off00005a46.bin
97f93d9912063ad84d6da8f5388cb4ed28d42761fea152f453ba697ffe4511aa
pdf-font-stream PDF embedded font (sfnt) at offset 0x5A46 5256 bytes
font_01_sfnt_off00006c2e.bin
2dc35913ce0ad0bd3d231e10bc95271a60cd5245ac16740252f77815bd9791f1
pdf-font-stream PDF embedded font (sfnt) at offset 0x6C2E 9424 bytes