Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce862937e8c2aa20…

MALICIOUS

PDF

33.2 KB Created: 2020-08-05 17:22:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d14cc6ce84351a1bf85dc01789767179 SHA-1: 21fa3fe265d1db45a0c4ca00e3933a13d43fabe8 SHA-256: ce862937e8c2aa205265024ad13786d3f416dcdf8b60947f0fe86721fc61b752
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to Shopify domains, which are likely part of a link farm to improve search engine ranking for malicious content. One critical heuristic identified a link to a known malicious redirector at 'ttraff.ru', suggesting a phishing or malware distribution attempt. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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/wb?keyword=platinum%20physical%20science%20grade%2011%20pdf
    • http://files.gilbertparksandrecreationfoundation.org/uploads/1/3/1/8/131871467/1542920.pdf
    • http://lizeviti.pmubywendyrose.com/uploads/1/3/0/7/130738841/vapanalomo_migujaf_siresamug.pdf
    • http://files.jagtheatre.com/uploads/1/3/1/4/131406491/9207116.pdf
    • http://files.cofina.co.uk/uploads/1/3/1/8/131872048/06465d9a69.pdf
    • https://cdn.shopify.com/s/files/1/0439/0171/4587/files/40275832908.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/kovogosiwe.pdf
    • https://cdn.shopify.com/s/files/1/0435/3549/9418/files/60658984945.pdf
    • https://cdn.shopify.com/s/files/1/0429/8778/2297/files/68666433113.pdf
    • https://cdn.shopify.com/s/files/1/0436/8737/9094/files/aneurisma_de_aorta_descendente.pdf
    • https://cdn.shopify.com/s/files/1/0430/9581/8404/files/nerurenaxax.pdf
    • https://cdn.shopify.com/s/files/1/0437/2771/6520/files/bafasofixubukadut.pdf
    • https://cdn.shopify.com/s/files/1/0433/2254/0185/files/wexewojitepeboforixo.pdf
    • https://cdn.shopify.com/s/files/1/0430/2172/9955/files/kovovikusebu.pdf
    • https://cdn.shopify.com/s/files/1/0431/2937/2821/files/59978381841.pdf
    • https://cdn.shopify.com/s/files/1/0431/1829/7245/files/zekujuzojedaro.pdf
    • https://cdn.shopify.com/s/files/1/0433/1605/2123/files/fisanovopov.pdf
    • https://cdn.shopify.com/s/files/1/0434/8523/3318/files/ancient_egypt_history_textbook.pdf
    • https://cdn.shopify.com/s/files/1/0432/5313/7576/files/20099907496.pdf
    • https://cdn.shopify.com/s/files/1/0439/1275/7400/files/12393579859.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_off0000455c.bin
e54bab74f9e7dabbb9d88004f5e5ea4cbb5ddaa75d32afa1937ae7e52cee1af8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x455C 5724 bytes
font_01_sfnt_off000058b9.bin
c01057bf57df8c3ea8d34a88e4d781a9185cc3d97d337978fc91db09b6c43b42		 pdf-font-stream PDF embedded font (sfnt) at offset 0x58B9 8928 bytes

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