Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba9d3b0adb244c75…

MALICIOUS

PDF

48.0 KB Created: 2020-08-01 01:42:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 36751230fb8066649de5e5f9b9a9d45c SHA-1: 7fc17b94766ddabc7d0f450181dc6607fc85156c SHA-256: ba9d3b0adb244c75877f04c09e7f79560dc8f8faadba80d7929164495868f669
152 Risk Score

Malware Insights

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

The PDF file was flagged by multiple critical heuristics for containing a malicious redirector link and a large link farm. The ML classifier also strongly indicated maliciousness. The primary malicious URL identified is https://ttraff.ru/pify?keyword=scandal%2528+american+band%2529, which is likely used to redirect users to a phishing or malware distribution site. The document body contains numerous embedded URLs, many pointing to Shopify domains, but one critical redirector. No scripts were extracted from this sample.

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=scandal%2528+american+band%2529
    • http://files.mysteinertech.com/uploads/1/3/0/9/130969322/1555628.pdf
    • http://files.paulwestplumbing.com/uploads/1/3/1/3/131383977/950ee484750c.pdf
    • http://files.natronacountyhs.org/uploads/1/3/1/3/131379353/9299432.pdf
    • https://cdn.shopify.com/s/files/1/0441/2293/1352/files/zogodedefamisep.pdf
    • https://cdn.shopify.com/s/files/1/0438/5298/8566/files/jidogakawe.pdf
    • https://cdn.shopify.com/s/files/1/0430/3699/9831/files/ligapenazokoxalode.pdf
    • https://cdn.shopify.com/s/files/1/0437/3417/1813/files/difference_between_mixtape_and_album.pdf
    • https://cdn.shopify.com/s/files/1/0432/1666/6786/files/dereroliresalobiforeketiw.pdf
    • https://cdn.shopify.com/s/files/1/0431/4228/3432/files/94030435131.pdf
    • https://cdn.shopify.com/s/files/1/0430/5725/0455/files/91534054554.pdf
    • https://cdn.shopify.com/s/files/1/0434/9244/2264/files/sapotopikurudupanedejob.pdf
    • https://cdn.shopify.com/s/files/1/0429/9715/3943/files/46472388961.pdf
    • https://cdn.shopify.com/s/files/1/0433/5458/7288/files/87041968145.pdf
    • https://cdn.shopify.com/s/files/1/0434/9558/8002/files/nizazudemavaxaxilu.pdf
    • https://cdn.shopify.com/s/files/1/0435/1816/5144/files/raxitedovidejefup.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_off00006194.bin
a3649a5590163c096e3c2610027e6c3a7c7fec4a77dc7cde5543705f1f7705c7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6194 8332 bytes
font_01_sfnt_off00007d79.bin
7b52e590921de5d65cebe4be1067b9a694f7b465983a985390a50bef4cbc0f73		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7D79 5304 bytes
font_02_sfnt_off00008f79.bin
46c53742257b05b8da3d41d32fd65d6e7633100cdc15c506ae902f78bab60951		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8F79 10376 bytes

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