Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7fb4be7afb12ea6…

MALICIOUS

PDF

51.2 KB Created: 2020-08-14 11:49:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 135fab05b19cd1d4d9f966c68ff8eb1e SHA-1: ee631ec3567a88673ad274dabb38150f5c49c28f SHA-256: a7fb4be7afb12ea6bd8ae20f9e667e4c92db227828e9283342613cfb255b15b8
150 Risk Score

Malware Insights

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

The PDF was flagged by multiple critical heuristics for containing malicious redirector links and a large link farm. The embedded URL points to a known malicious redirector, ttraff.ru, which is likely used to obscure the final destination of the malicious payload. The document body contains garbled text but also includes the malicious URL and several Shopify-hosted PDF links, suggesting a link-based attack. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 3

  • 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.
  • 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=malayalam+christian+christmas+songs
    • http://files.pedagoguepodcast.com/uploads/1/3/0/7/130775528/nefaket.pdf
    • http://files.goodfaithfarmmd.com/uploads/1/3/1/4/131408056/ae7dba52b0bab.pdf
    • http://files.ambientled.net/uploads/1/3/1/8/131856476/939e9eeda3fa.pdf
    • http://files.ripplevfx.com/uploads/1/3/2/8/132814958/lizosifom.pdf
    • http://files.potluckfoundation.com/uploads/1/3/1/3/131398145/2396f789.pdf
    • https://cdn.shopify.com/s/files/1/0434/0632/7959/files/98135073228.pdf
    • https://cdn.shopify.com/s/files/1/0434/2395/7144/files/69532340340.pdf
    • https://cdn.shopify.com/s/files/1/0428/6434/5255/files/18843479409.pdf
    • https://cdn.shopify.com/s/files/1/0431/3061/8011/files/52456558011.pdf
    • https://cdn.shopify.com/s/files/1/0431/0958/0961/files/tamil_news_paper_today_download.pdf
    • https://cdn.shopify.com/s/files/1/0430/8772/4704/files/damodarastakam_telugu_lyrics.pdf
    • https://cdn.shopify.com/s/files/1/0430/7720/6178/files/29809531656.pdf
    • https://cdn.shopify.com/s/files/1/0436/2154/8194/files/goxixekusatumotijil.pdf
    • https://cdn.shopify.com/s/files/1/0432/9930/7678/files/physiology_of_muscle_growth.pdf
    • https://cdn.shopify.com/s/files/1/0439/6161/4494/files/pencil_drawing_anatomy.pdf
    • https://cdn.shopify.com/s/files/1/0429/5314/6517/files/24213167426.pdf
    • https://cdn.shopify.com/s/files/1/0428/7338/9223/files/48165166879.pdf
    • https://cdn.shopify.com/s/files/1/0429/8542/2997/files/94082907242.pdf

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008cd5.bin
873dd1f3d5ae669ec3761345a147e680090238ac3bdad337e72f5c6cd954d5e3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8CD5 5320 bytes
font_01_sfnt_off00009ed0.bin
169d4a8d57830a170bf398de9bb1fa38fcefe1217caf6f2689aee5513b3b030d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9ED0 13404 bytes

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