Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e1c0a0af58d5868…

MALICIOUS

PDF

45.4 KB Created: 2020-09-13 19:58:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e16436e09ad339412abbec7cfd623a6c SHA-1: 6c591c76676384f9693a6540b93040c703adce64 SHA-256: 5e1c0a0af58d58682f840e006381f51ab4d42e60c08f7ffc29fca1c913b0f0be
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic identifying a link to a known malicious redirector. The document body, though heavily obfuscated, also contains a URL pointing to this redirector. The presence of many external PDF links suggests a link farm or SEO manipulation tactic, potentially to obscure the malicious redirector.

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.club/pify?keyword=dong+tu+bat+quy+tac+think
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/9123/7794/files/87085452334.pdf
    • https://cdn.shopify.com/s/files/1/0431/3939/9842/files/fimak.pdf
    • https://cdn.shopify.com/s/files/1/0431/4244/7265/files/biwidufeboxamenezexela.pdf
    • https://cdn.shopify.com/s/files/1/0432/2872/5405/files/10874960081.pdf
    • https://cdn.shopify.com/s/files/1/0433/7857/3475/files/46934469777.pdf
    • https://static.usrfiles.com/ugd/46429b_d940e5e7ec224732aa3418e9d5c9a1ff.pdf
    • https://static.usrfiles.com/ugd/83d902_34fafa90341c4490808a8a85930006b6.pdf
    • https://static.usrfiles.com/ugd/c618e9_c4804235dc5f4b138737f6b06c4517f9.pdf
    • https://static.usrfiles.com/ugd/d01287_55d2144970cd416385dbd8a81cb8ced8.pdf
    • https://static.usrfiles.com/ugd/3615fb_7e6a51e37c7d40b78bb7854e7a6aaa5a.pdf
    • https://cdn.shopify.com/s/files/1/0431/1059/6775/files/ace_player_vlc_android.pdf
    • https://cdn.shopify.com/s/files/1/0431/3759/7596/files/best_android_graphic_games_2019.pdf
    • https://static.usrfiles.com/ugd/4e977a_840ed4762045484e962838ec1b06c758.pdf
    • https://static.usrfiles.com/ugd/d63aaf_29debc1df57644ddb3a03f5fb8a4d6af.pdf
    • https://static.usrfiles.com/ugd/67e251_81269da0065b43d2b311169c1c2c3652.pdf
    • https://static.usrfiles.com/ugd/e32576_02a5545efd014321a40fcc96706c4310.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_off000061f6.bin
e06c2b6e08ea635cace9adf4cbd237a8ab5d5e6b0b65b400d4192a622ccc734c
pdf-font-stream PDF embedded font (sfnt) at offset 0x61F6 5188 bytes
font_01_sfnt_off000073b3.bin
4318ddb56b467984d07d16a88f8ec2b37fea7d00862c325cb3ca6d8fa5961b53
pdf-font-stream PDF embedded font (sfnt) at offset 0x73B3 22024 bytes