Malicious PDF — malware analysis report

Static analysis result for SHA-256 850cf84f054a747d…

MALICIOUS

PDF

42.8 KB Created: 2020-08-15 13:24:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b59bcf81edecd807b8e804e31254f72d SHA-1: 37a2ffa642c3c6fc19c43a3fae62a32691daae78 SHA-256: 850cf84f054a747d2da817821906e812fa76321f3dd2f209a69621c3f7a69dea
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, specifically pointing to 'ttraff.com'. The document body, though partially corrupted, includes this URL and appears to be a lure related to 'slopes of lines worksheet answers'. The presence of numerous other PDF links, many hosted on Shopify, suggests a link farm or SEO poisoning tactic to distribute the malicious content. The ML classifier also strongly flagged this PDF as malicious.

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.com/wb?keyword=3-5%20slopes%20of%20lines%20worksheet%20answers
    • http://files.dodlestonparishcouncil.co.uk/uploads/1/3/1/8/131856539/xazutoguwovuwobokib.pdf
    • https://cdn.shopify.com/s/files/1/0437/5986/1909/files/27719246987.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/zevuwuvufotolotatagonisex.pdf
    • https://cdn.shopify.com/s/files/1/0440/6339/1894/files/how_to_remove_border_from_plot_matplotlib.pdf
    • https://cdn.shopify.com/s/files/1/0437/4321/5767/files/pobad.pdf
    • https://cdn.shopify.com/s/files/1/0430/1645/4305/files/5030824322.pdf
    • https://cdn.shopify.com/s/files/1/0434/1835/3815/files/bruce_almighty_full_movie_dual_audio.pdf
    • https://cdn.shopify.com/s/files/1/0438/4958/0704/files/fejik.pdf
    • https://cdn.shopify.com/s/files/1/0447/1944/0028/files/une_bonne_hygine_de_vie.pdf
    • https://cdn.shopify.com/s/files/1/0432/4763/2548/files/32540424990.pdf
    • https://cdn.shopify.com/s/files/1/0432/2649/7182/files/susaladoromonezufi.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_off00005a15.bin
d5913d658c167c02119593cef20a90b7d4b3abedfe4f002c54eff029325630df		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5A15 5156 bytes
font_01_sfnt_off00006b9f.bin
57f64d57cc05567ad346f132fde8c88ca6136d0ed45ee18ac5dcd8966f617bc8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6B9F 10856 bytes
font_02_sfnt_off00009055.bin
ad623bc7c681097dfa1224999cf6cc6072d3ca9a137655dc1129b0261f0b357c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9055 4324 bytes

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