Malicious PDF — malware analysis report

Static analysis result for SHA-256 daf0358bcba90b90…

MALICIOUS

PDF

44.8 KB Created: 2020-08-19 18:19:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ab61cea70bb7084f84a7ad130b44b921 SHA-1: af434e3fd9cd454cabb0ccc72aa62b9e2dd77bd6 SHA-256: daf0358bcba90b90369560c9f159afbf24bb4092352b172d9ee9720f9a407bf2
150 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to ttraff.ru. Additionally, it exhibits characteristics of a PDF link farm, with numerous embedded links, many of which are hosted on Shopify. The ML classifier strongly flagged this PDF as malicious. The primary attack vector appears to be directing users to malicious infrastructure via a link disguised within the document content.

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=background+music+free++without+copyright
    • http://fizexugew.flaentertainmentinsider.com/uploads/1/3/0/8/130814328/3530869.pdf
    • http://files.davescustomcars.ca/uploads/1/3/0/7/130774993/dozigafexukefifodiki.pdf
    • http://files.wehelpmoving.ca/uploads/1/3/1/1/131164007/7b2e487fb617.pdf
    • https://cdn.shopify.com/s/files/1/0433/3027/3448/files/basic_self_defense_moves.pdf
    • https://cdn.shopify.com/s/files/1/0431/3215/8116/files/28555821719.pdf
    • https://cdn.shopify.com/s/files/1/0465/4596/1118/files/canada_immigration_generic_application_form.pdf
    • https://cdn.shopify.com/s/files/1/0434/5125/2896/files/c_remove_duplicates_from_vector.pdf
    • https://cdn.shopify.com/s/files/1/0433/4885/2904/files/82262708533.pdf
    • https://cdn.shopify.com/s/files/1/0435/5486/5320/files/22234811732.pdf
    • https://cdn.shopify.com/s/files/1/0427/7937/7830/files/suffix_words_list.pdf
    • https://cdn.shopify.com/s/files/1/0429/1510/2876/files/wikowiboxarej.pdf
    • https://cdn.shopify.com/s/files/1/0429/4855/9004/files/rotab.pdf
    • https://cdn.shopify.com/s/files/1/0436/7558/2617/files/46081845976.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_off00006f00.bin
4231f274081b4289204fec447ab6f0ccda0cc4314c54322f3b14d9204d4567a7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F00 5844 bytes
font_01_sfnt_off000082da.bin
7a69de7dac876ca152300561c340cb827cb73bb429d6fa75cccd5d871642313c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x82DA 10404 bytes

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