Malicious PDF — malware analysis report

Static analysis result for SHA-256 c17824b90b227f14…

MALICIOUS

PDF

53.4 KB Created: 2020-08-28 13:25:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bef92ff062341ccd1f233963885bcefc SHA-1: 1ab9adc24c568a4e6a6ff5833f2116ebbe5ced16 SHA-256: c17824b90b227f14a64f2ae3e67f8ee1b5d3e95c2d0b31ad90a26bf28b2519f0
150 Risk Score

Malware Insights

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

The PDF file contains a significant number of embedded links, many of which point to external PDF files hosted on various domains. One critical heuristic identified a link to a known malicious redirector infrastructure at 'https://ttraff.ru/pify?keyword=general+grievous+without+mask'. Another heuristic flagged the PDF for containing a mass external PDF link farm, with the dominant host being cdn.shopify.com. The ML classifier also strongly indicated maliciousness. The presence of these numerous links, including one to a known malicious redirector, suggests a tactic aimed at either SEO manipulation or user redirection to malicious sites.

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=general+grievous+without+mask
    • http://files.freebiequeen13.net/uploads/1/3/1/3/131383720/kefidiguladuku_polulamokos_zizutuduloka.pdf
    • https://cdn.shopify.com/s/files/1/0434/7753/2822/files/personal_hygiene_worksheets.pdf
    • https://cdn.shopify.com/s/files/1/0434/5774/0957/files/48314909305.pdf
    • https://cdn.shopify.com/s/files/1/0430/6462/3265/files/60785434071.pdf
    • https://cdn.shopify.com/s/files/1/0432/7066/8453/files/pegema.pdf
    • https://cdn.shopify.com/s/files/1/0435/4785/2959/files/39442366295.pdf
    • https://cdn.shopify.com/s/files/1/0430/3713/0914/files/punjabi_song_free_downlord.pdf
    • https://cdn.shopify.com/s/files/1/0431/3645/0717/files/bexafasaw.pdf
    • https://cdn.shopify.com/s/files/1/0446/2762/4099/files/bajrang_bali_dj_songs.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_off0000956a.bin
dafa71eca8017ca992bad4f1074656aeba59e1d2c505cf44433d7c8249d9a323		 pdf-font-stream PDF embedded font (sfnt) at offset 0x956A 5348 bytes
font_01_sfnt_off0000a789.bin
2d0b03b52a03fd0f2a36bb981b5c647ff0b9809d693b967a24a4735814a02ddc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA789 9908 bytes

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