Malicious PDF — malware analysis report

Static analysis result for SHA-256 77a116db23e0c6d2…

MALICIOUS

PDF

38.8 KB Created: 2020-09-06 01:02:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: af22019df3ccf7f4059985f47bbc3bba SHA-1: e6cfe5189d51fb7899653d7a95006b4fe5594b99 SHA-256: 77a116db23e0c6d2c8e30657cea53681efa8b718f16e64b1daf1878c9e62a2f9
150 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, identified as a link farm. One of these links, 'https://ttraff.ru/pify?keyword=bombas+de+engranajes+parker+pdf', is flagged as a malicious redirector. The document body, though heavily corrupted, contains fragments of the same URL, suggesting the primary intent is to redirect the user to malicious infrastructure. The ML classifier also strongly indicated maliciousness.

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=bombas+de+engranajes+parker+pdf
    • https://cdn.shopify.com/s/files/1/0428/8872/4639/files/jirol.pdf
    • https://cdn.shopify.com/s/files/1/0433/4606/7621/files/fevulopexemawaxufin.pdf
    • https://cdn.shopify.com/s/files/1/0463/4470/0066/files/tujof.pdf
    • https://static.usrfiles.com/ugd/a474dd_b4640d5875c34af8a4d7f8555ee673e5.pdf
    • https://static.usrfiles.com/ugd/5c9621_d9da583d070a401fb5daa0cf56c8c642.pdf
    • https://static.usrfiles.com/ugd/b8c837_82ffa41a2f0a4ea58ef08650f38e5c37.pdf
    • https://cdn.shopify.com/s/files/1/0434/5672/5153/files/19287134148.pdf
    • https://cdn.shopify.com/s/files/1/0438/3001/8210/files/hewlett_packard_dl380_g5.pdf
    • https://static.usrfiles.com/ugd/a58b01_e97ce70c94864cb38067e4cd7c38a31e.pdf
    • https://static.usrfiles.com/ugd/77941b_13905e7dc2a4471481b0a6c20bbd2645.pdf
    • https://static.usrfiles.com/ugd/19ce5d_24a0f407264041ce853cd87cc18e2833.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_off00004baf.bin
6c96795b0571f8b925faadc19214cf3578a0310b98f3b37b1b862b85259991c6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4BAF 5316 bytes
font_01_sfnt_off00005da1.bin
b9c80af5825ca8a1b6e220f44325dd97f52c6d49bc1f34a413de58e429ab0a40		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5DA1 10704 bytes
font_02_sfnt_off0000808a.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0x808A 4324 bytes

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