Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d3dff763def9528…

MALICIOUS

PDF

54.4 KB Created: 2020-08-29 16:20:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1012fb0b2245ce4a69161d71a9edd687 SHA-1: 03543bb3d12191a2faed00f3d194dafc62e1dda6 SHA-256: 3d3dff763def9528c006c8846129ba5891369671900e9bb23f6395345a7debf6
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF file was flagged as malicious by an ML classifier and contains a significant number of embedded links, with one identified as a known malicious redirector. The document body, though heavily obfuscated, contains the URL https://ttraff.cc/wix?keyword=monster+hunter+world+pets+list, which is a primary indicator of malicious intent. The presence of a link farm suggests an attempt to distribute malicious content or phish users.

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=monster+hunter+world+pets+list
    • https://static.usrfiles.com/ugd/b8c837_cd66ccfa2f12473cb82d7843285f405b.pdf
    • https://static.usrfiles.com/ugd/b8c837_6ec4706ada314defaeb0606485b40336.pdf
    • https://static.usrfiles.com/ugd/80bfa9_6080c5272dd5473eb24d9cc1213272e3.pdf
    • https://static.usrfiles.com/ugd/824332_5902b0d6d3434182ab0c6b1163e4b8c3.pdf
    • https://static.usrfiles.com/ugd/b8c837_fd1238f0b46d4037a71f11897567eaff.pdf
    • https://cdn.shopify.com/s/files/1/0431/8520/9512/files/suworogetoxe.pdf
    • https://cdn.shopify.com/s/files/1/0429/2883/2675/files/11631755696.pdf
    • https://cdn.shopify.com/s/files/1/0431/6839/9524/files/44134962754.pdf
    • https://static.usrfiles.com/ugd/b8c837_b598d61539d341b69596c25235f27f7c.pdf
    • https://static.usrfiles.com/ugd/b8c837_6183246d100d46d28dc6b95d7a1db236.pdf
    • https://static.usrfiles.com/ugd/b8c837_eda7c594d0324581b93b3598a1df4084.pdf
    • https://static.usrfiles.com/ugd/b8c837_84c271c54998472f8e064733a317bc94.pdf
    • https://cdn.shopify.com/s/files/1/0435/2966/6724/files/rulejekolilapasa.pdf
    • https://cdn.shopify.com/s/files/1/0446/7264/7331/files/manual_de_microbiologia_clinica.pdf
    • https://cdn.shopify.com/s/files/1/0432/3174/0066/files/diff_b_w_chordates_and_non_chordates.pdf
    • https://cdn.shopify.com/s/files/1/0435/7872/0414/files/dozorelowetepijewika.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_off00009934.bin
87e11fbf12889aecefcb19798738e2e03600186068e5ae24b46db50fcee4965b
pdf-font-stream PDF embedded font (sfnt) at offset 0x9934 4932 bytes
font_01_sfnt_off0000aa08.bin
62422a243e74019ac2aa43b668499bea3181581a0b0a87d0f1f7b04c69f17341
pdf-font-stream PDF embedded font (sfnt) at offset 0xAA08 10128 bytes