Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e816a022a28579f…

MALICIOUS

PDF

41.7 KB Created: 2020-08-22 16:56:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 25d512fcf0bc86446772b92ebac5f6a4 SHA-1: 8675e39a857651d2ad3b31ab5ccf433594c3911c SHA-256: 7e816a022a28579fd84cb278510f8b7bb84c3148c64c8e10fa4916a329bbe0c3
154 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous external PDFs, with one primary link identified as a malicious redirector. The ML classifier strongly indicated maliciousness. The document body, though malformed, contains text related to sports injuries and a URL that matches the malicious redirector identified by heuristics. This suggests a lure to a phishing or malware distribution site.

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=lions+vs+chargers+injury+report
    • http://files.asavorytable.com/uploads/1/3/1/3/131397946/d4e6a80e68432c.pdf
    • http://rimawujo.in2yogalapeer.com/uploads/1/3/1/3/131380005/bdde5.pdf
    • https://cdn.shopify.com/s/files/1/0433/6372/9557/files/76210133809.pdf
    • https://cdn.shopify.com/s/files/1/0430/4614/2114/files/39676881762.pdf
    • https://cdn.shopify.com/s/files/1/0429/1405/4300/files/happy_birthday_dj_remix_ringtone.pdf
    • https://cdn.shopify.com/s/files/1/0430/9221/3911/files/fulemifegosobilebozu.pdf
    • https://cdn.shopify.com/s/files/1/0435/5552/0673/files/acrobat_reader_dc_download.pdf
    • https://cdn.shopify.com/s/files/1/0428/0057/8723/files/xerewevigegofopej.pdf
    • https://cdn.shopify.com/s/files/1/0451/9510/0311/files/57298714230.pdf
    • https://cdn.shopify.com/s/files/1/0430/2821/8019/files/whirlpool_washing_machine_manual_spanish.pdf
    • https://cdn.shopify.com/s/files/1/0437/1375/7339/files/10052608368.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_off000064f0.bin
d9cab7002828673d77a29d6c6f0851f1309c7ae3d2cd147ad0e630e0e041b58c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x64F0 5344 bytes
font_01_sfnt_off0000772c.bin
5f288f71fb51ae472a87a41a6e5103367c9765c3d99dd446a849b535ffe7192e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x772C 10300 bytes

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