Malicious PDF — malware analysis report

Static analysis result for SHA-256 83646fd9112a87bf…

MALICIOUS

PDF

42.6 KB Created: 2020-08-26 00:52:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f4c3ebb2b093bae8e3c359ff0d71e76d SHA-1: e794a7bf939af838a121f8b222132597358317ae SHA-256: 83646fd9112a87bf43fa2cb62a9b989a3537db1b43447db83fdf56f9c59af97f
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure. Additionally, it exhibits characteristics of a PDF SEO link farm, with numerous embedded links, many pointing to Shopify domains. The primary malicious URL is https://ttraff.ru/pify?keyword=%25D1%2581%25D0%25BA%25D0%25B0%25D1%2587%25D0%25B0%25D1%2582%25D1%258C+%25D1%2584%25D0%25B8%25D0%25BB%25D1%258C%25D0%25BC+%25D1%2581%25D0%25B2%25D0%25BE%25D0%25B4%25D0%25BD%25D0%25B0%25D1%258F+%25D1%2581%25D0%25B5%25D1%2581%25D1%2582%25D1%2580%25D0%25B0+%25D0%25BD%25D0%25B0+%25D1%2582%25D0%25B5%25D0%25BB%25D0%25B5, which is likely used to obscure the final destination. The ML classifier also strongly indicated maliciousness.

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=%25D1%2581%25D0%25BA%25D0%25B0%25D1%2587%25D0%25B0%25D1%2582%25D1%258C+%25D1%2584%25D0%25B8%25D0%25BB%25D1%258C%25D0%25BC+%25D1%2581%25D0%25B2%25D0%25BE%25D0%25B4%25D0%25BD%25D0%25B0%25D1%258F+%25D1%2581%25D0%25B5%25D1%2581%25D1%2582%25D1%2580%25D0%25B0+%25D0%25BD%25D0%25B0+%25D1%2582%25D0%25B5%25D0%25BB%25D0%25B5
    • http://jivekuz.therefugevbc.com/uploads/1/3/2/8/132814930/3abb433c5ca.pdf
    • http://fonat.stbrendansfish.com/uploads/1/3/0/9/130969761/9786372.pdf
    • http://files.kaikalanortherninuits.com/uploads/1/3/0/8/130874676/106955db7172a0.pdf
    • http://files.pixiechickproductions.com/uploads/1/3/1/6/131606490/rapududonimisumigife.pdf
    • https://cdn.shopify.com/s/files/1/0429/9377/8837/files/22718375554.pdf
    • https://cdn.shopify.com/s/files/1/0430/3791/7335/files/kuxapidiseje.pdf
    • https://cdn.shopify.com/s/files/1/0436/9544/0040/files/goxexanulevemelej.pdf
    • https://cdn.shopify.com/s/files/1/0428/6355/8815/files/ikea_deep_fitted_bed_sheets.pdf
    • https://cdn.shopify.com/s/files/1/0432/4343/8242/files/kasinonowufu.pdf
    • https://cdn.shopify.com/s/files/1/0428/1407/9143/files/votat.pdf
    • https://cdn.shopify.com/s/files/1/0429/5226/1795/files/92211419117.pdf
    • https://cdn.shopify.com/s/files/1/0434/0098/6787/files/fomovogedijakigizixejir.pdf
    • https://cdn.shopify.com/s/files/1/0434/5944/4889/files/4843132129.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/53607129813.pdf
    • https://cdn.shopify.com/s/files/1/0430/8641/3985/files/minecraft_attack_on_titan_servers.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/
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/53607129

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000596a.bin
8ed6fd915616e17ef0cb81eb9c1e29331db1858fc054299d65f50706b976e3e2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x596A 6028 bytes
font_01_sfnt_off00006d2b.bin
37e8fc2917f1eb962f366ed37f4280e5bbc4a4aeed8e2992e4b3bddeaf5905f8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6D2B 14540 bytes

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