Malicious PDF — malware analysis report

Static analysis result for SHA-256 f490ed77570a8ce4…

MALICIOUS

PDF

66.1 KB Created: 2020-09-02 05:28:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 16280f71bfac528a74439f433726f697 SHA-1: d9a604d3e80ea5d2953cc95c60ff3ef647e46bbe SHA-256: f490ed77570a8ce4ff88156be76ceb1ba1cfb7fbf6bf5d6bb31b1586f6bb5096
152 Risk Score

Malware Insights

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

The PDF file was flagged by multiple critical heuristics indicating malicious redirector links and a link farm. The ML classifier also strongly indicated maliciousness. The document body contains a URL that points to a known malicious redirector, and numerous other links, predominantly hosted on Shopify, are embedded within the document. The primary purpose appears to be directing users to potentially harmful external content.

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.ru/pify?keyword=bootstrap+4+css+and+js
    • https://cdn.shopify.com/s/files/1/0437/9521/8594/files/tilapia_production_in_the_philippines.pdf
    • https://cdn.shopify.com/s/files/1/0434/4299/5367/files/dibigeb.pdf
    • https://cdn.shopify.com/s/files/1/0430/5158/1597/files/32740856216.pdf
    • https://cdn.shopify.com/s/files/1/0431/4716/5850/files/final_report_card_comments_for_kindergarten_tagalog.pdf
    • https://static.usrfiles.com/ugd/b8c837_4100a99324054c1783948dde4ecb7c1a.pdf
    • https://cdn.shopify.com/s/files/1/0440/3298/3205/files/zuzanapafipubelabu.pdf
    • https://cdn.shopify.com/s/files/1/0430/7664/9121/files/brown_butcher_paper_sheets.pdf
    • https://cdn.shopify.com/s/files/1/0430/6285/3794/files/kafudubugaduxe.pdf
    • https://static.usrfiles.com/ugd/3e5db3_18a077cce6a6435c89da9fd5f7ae09a3.pdf
    • https://static.usrfiles.com/ugd/374ce0_6aace07cc3bf4cf49613982e2434b492.pdf
    • https://static.usrfiles.com/ugd/f4de5e_d08267063a0541d8bfc3c10c39209804.pdf
    • https://static.usrfiles.com/ugd/39cb9d_205330612ba347c4891c4a307ea6db34.pdf
    • https://static.usrfiles.com/ugd/1f5cef_e1801e14b4c547ef9b32cfba1c41779a.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_off0000b71a.bin
447df93c2f6c0c9eb6f17e562553eb950441cbe6ea2c55ab1af7b2e3c21c9f0c
pdf-font-stream PDF embedded font (sfnt) at offset 0xB71A 5248 bytes
font_01_sfnt_off0000c90f.bin
a6ab9af7e009f8a8d7594669bcc2c712c00827e6e4f90657e6d648a7c83e5026
pdf-font-stream PDF embedded font (sfnt) at offset 0xC90F 16124 bytes