Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8432ba35d0c8535…

MALICIOUS

PDF

43.5 KB Created: 2020-09-28 16:47:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 01b79ceed3ab511a138e73b28133dd56 SHA-1: f10a924745668a32d8c79f745febac106ccb97c1 SHA-256: a8432ba35d0c8535fba245605e138a1e5df3c1ded4dd528e8c26425bc4852e13
150 Risk Score

Malware Insights

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

The PDF file was flagged as malicious due to its inclusion of a redirector link pointing to suspicious infrastructure. It also contains a large number of external links, characteristic of a link farm, with the primary malicious URL being ggtraff.ru. The document body, though heavily obfuscated, contains the same malicious URL, reinforcing the finding. No scripts were extracted, and the family is unknown.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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://ggtraff.ru/mozel?keyword=borderline+personality+disorder+books+pdf
    • https://site-1037035.mozfiles.com/files/1037035/69368427172.pdf
    • https://site-1037238.mozfiles.com/files/1037238/ketub.pdf
    • https://site-1036621.mozfiles.com/files/1036621/39123741739.pdf
    • https://site-1036719.mozfiles.com/files/1036719/munor.pdf
    • https://cdn.shopify.com/s/files/1/0438/9748/7512/files/90982394135.pdf
    • https://cdn.shopify.com/s/files/1/0483/5524/6240/files/4342530643.pdf
    • https://cdn.shopify.com/s/files/1/0469/5018/7169/files/up_movie_piano_sheet_music.pdf
    • https://cdn.shopify.com/s/files/1/0434/7900/7398/files/american_standard_freedom_80_manual.pdf
    • https://cdn.shopify.com/s/files/1/0430/7006/2754/files/nemipav.pdf
    • https://cdn.shopify.com/s/files/1/0433/5563/5880/files/71690423111.pdf
    • https://cdn.shopify.com/s/files/1/0428/5494/0828/files/rezizibiwirexowug.pdf
    • https://cdn.shopify.com/s/files/1/0454/2873/6168/files/31590016323.pdf
    • https://cdn.shopify.com/s/files/1/0435/6934/8763/files/sopagomebomidamekotob.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_off00006bcd.bin
aec09a4e88363e2d303fdcb2fb1817df50c377ad591890bf6ab5386a2c699cfd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6BCD 5392 bytes
font_01_sfnt_off00007e37.bin
11901475305ff5cff9e63663c0cc7747418c271acd9483e8a8b31bf083906b6d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7E37 10192 bytes

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