Malicious PDF — malware analysis report

Static analysis result for SHA-256 a54e11383d1b994c…

MALICIOUS

PDF

32.4 KB Created: 2020-08-11 15:27:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ad295e86fe3ed9b682b919f3eaadb52a SHA-1: 32cc5ed57a3a77510823ec4c524e5d32197a66dd SHA-256: a54e11383d1b994cc0ffa3ce4dbb751604af3415da60fc53dc20854d7bcf296b
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by multiple critical heuristics for containing malicious redirector links and a large link farm. The embedded URL points to a redirector, and the document body contains numerous links, including one to 'ttraff.ru', which is known malicious infrastructure. The ML classifier also strongly indicated maliciousness. The primary attack pattern involves luring users to external sites via these links.

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://ttraff.ru/pify?keyword=agnello+di+dio+frisina+pdf
    • http://files.radfordcoffeeco.com/uploads/1/3/1/3/131383478/gonakori-sazenisafavoraw-bamij-mupuzexokomojof.pdf
    • http://files.aylinlaw.com/uploads/1/3/1/4/131437987/wovozokinikovezelog.pdf
    • http://files.pdxprays.com/uploads/1/3/1/3/131383018/wikixawasagi.pdf
    • https://cdn.shopify.com/s/files/1/0433/2191/7598/files/pumiwaripigozawuzukiw.pdf
    • https://cdn.shopify.com/s/files/1/0439/2920/6939/files/label_39_id.pdf
    • https://cdn.shopify.com/s/files/1/0447/9824/7069/files/latex_multiline_comment.pdf
    • https://cdn.shopify.com/s/files/1/0437/7241/2055/files/54694706942.pdf
    • https://cdn.shopify.com/s/files/1/0435/5227/6632/files/65233148455.pdf
    • https://cdn.shopify.com/s/files/1/0434/0318/2231/files/1000_largest_cities_in_the_us.pdf
    • https://cdn.shopify.com/s/files/1/0428/8475/9711/files/26125988930.pdf
    • https://cdn.shopify.com/s/files/1/0430/9791/5545/files/26978250018.pdf
    • https://cdn.shopify.com/s/files/1/0431/0273/2448/files/examples_of_interval_variables.pdf
    • https://cdn.shopify.com/s/files/1/0447/3297/3205/files/learn_autocad_basics_in_21_days_download.pdf
    • https://cdn.shopify.com/s/files/1/0437/4410/0506/files/24141029935.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_off00004370.bin
f02b9792baf0943c7dc068fa3aae97cada68361e7f0a15095e6ca0c3ac06b45c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4370 5200 bytes
font_01_sfnt_off0000552e.bin
1c778f3c87c976919090b02df2662139f5f0053d499aeeadc726746017041ad7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x552E 9540 bytes

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