Malicious PDF — malware analysis report

Static analysis result for SHA-256 a086befea073f7cd…

MALICIOUS

PDF

47.3 KB Created: 2020-08-30 19:00:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e327c18b6d768e13e859d430304d49d8 SHA-1: b4e53b411395d5277f278188410d42d77f986d21 SHA-256: a086befea073f7cd626209f7c4cb0f3b7b5176c9bf6ee6a27db4bd618d91183b
154 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link that points to a URL associated with game-related keywords, likely as a lure. The document body, though heavily obfuscated, also contains this URL and other benign-looking PDF links, suggesting a link farm or redirection tactic. The ML classifier strongly flagged this PDF as malicious.

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/wix?keyword=plants+vs+zombies+2+mod+apk+hack+all+plants+unlocked
    • https://cdn.shopify.com/s/files/1/0432/3658/9730/files/86171281671.pdf
    • https://cdn.shopify.com/s/files/1/0432/4877/9426/files/computer_science_illuminated.pdf
    • https://cdn.shopify.com/s/files/1/0437/0530/3205/files/66064355492.pdf
    • https://cdn.shopify.com/s/files/1/0431/8311/2341/files/four_main_characteristics_of_an_information_society.pdf
    • https://static.usrfiles.com/ugd/a4d998_7ca36134bb1946a39293798dc9bc872e.pdf
    • https://static.usrfiles.com/ugd/b8c837_b66af327c13643228fe2a10cfe26f05c.pdf
    • https://static.usrfiles.com/ugd/b8c837_0abbcbbff42644c4a10cc8ae1872525a.pdf
    • https://static.usrfiles.com/ugd/12f4eb_637c5090964f4ee5a024b7d08791b75f.pdf
    • https://static.usrfiles.com/ugd/b8c837_17deed89015940d9a6f183a05e92f7a5.pdf
    • https://static.usrfiles.com/ugd/b8c837_c76d37e2515a4a21b7f32e3888465f3a.pdf
    • https://static.usrfiles.com/ugd/a107db_239e23274b214541bc053188e3fa44c3.pdf
    • https://static.usrfiles.com/ugd/67e251_68cba2cf74dd4463976dc64287915f0b.pdf
    • https://cdn.shopify.com/s/files/1/0440/8056/2326/files/maintenance_electrician_job_description.pdf
    • https://cdn.shopify.com/s/files/1/0434/2277/7496/files/what_is_first_angle_projection_in_engineering_drawing_pdf.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006341.bin
4479b06229812dbd5608ec8f3da04c798bde8aa7556233b3be60d94eeef06ee0
pdf-font-stream PDF embedded font (sfnt) at offset 0x6341 5664 bytes
font_01_sfnt_off0000766e.bin
1d42a422a0860fc53214fcca637533d3b64c5f9fb4cf73a6684890e04ddecab0
pdf-font-stream PDF embedded font (sfnt) at offset 0x766E 10728 bytes
font_02_sfnt_off00009af1.bin
24a56a00ebdfbb4b5b72d249a8195892d08ab8c6d2bc1baeb1e65ebcc908258d
pdf-font-stream PDF embedded font (sfnt) at offset 0x9AF1 16080 bytes