Malicious PDF — malware analysis report

Static analysis result for SHA-256 9169098f690156e8…

MALICIOUS

PDF

53.4 KB Created: 2020-08-09 05:59:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9a1c586f587eb35c815367dd00b21596 SHA-1: a7d42e6791c35a322d1e1a416afddcb06efb904b SHA-256: 9169098f690156e8bdbafda86bcbed4fa70e8a7ee6728bdc6d905e1e111fc443
150 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic, which points to ttraff.ru. This URL is likely used to redirect users to a malicious site. Additionally, the PDF exhibits characteristics of a link farm, with numerous embedded links to external resources, as indicated by the PDF_SEO_LINK_FARM heuristic. The ML classifier also strongly flagged this PDF as malicious. The primary malicious IOC is the redirector URL.

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=mathematical+notation+a+guide+for+engineers+and+scientists+pdf+download
    • http://kufogu.musicpoststudio.com/uploads/1/3/0/7/130739919/b49ae3880fc1.pdf
    • http://files.503512136382517917.com/uploads/1/3/1/3/131398487/7585784.pdf
    • http://files.tntchildcare.com/uploads/1/3/0/7/130739269/69d6f2feec24.pdf
    • https://cdn.shopify.com/s/files/1/0437/3757/9674/files/zanajepafulunudexiwoxob.pdf
    • https://cdn.shopify.com/s/files/1/0434/8493/8390/files/alimentos_alcalinos_y_acidos.pdf
    • https://cdn.shopify.com/s/files/1/0434/8326/7236/files/76295267069.pdf
    • https://cdn.shopify.com/s/files/1/0432/2790/6206/files/lusivugij.pdf
    • https://cdn.shopify.com/s/files/1/0437/6553/0785/files/new_real_book_2.pdf
    • https://cdn.shopify.com/s/files/1/0429/7926/2615/files/77542541554.pdf
    • https://cdn.shopify.com/s/files/1/0436/0221/5074/files/fomazuf.pdf
    • https://cdn.shopify.com/s/files/1/0433/1415/1589/files/fugokipar.pdf
    • https://cdn.shopify.com/s/files/1/0429/4829/6857/files/68503374791.pdf
    • https://cdn.shopify.com/s/files/1/0432/8102/3132/files/koxigazupijorawumupuder.pdf
    • https://cdn.shopify.com/s/files/1/0433/9115/6380/files/gofivilufekug.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_off00008f04.bin
6788c3b0aaae384bcb838ea31381b2371d0043ddb9109165277cb982be9eeb2b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8F04 5668 bytes
font_01_sfnt_off0000a246.bin
8c0df880d385746039bf168361e3e37f0e61c98bf8c8e40ed758cb683dbc33b5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA246 11128 bytes

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