Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd0bd048d9c74d65…

MALICIOUS

PDF

49.0 KB Created: 2020-08-05 08:02:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 855e9cbedb4116a16415401d912257d8 SHA-1: ecb1e53edeb1d3ffb47cef9126fe9ff77cbb1b96 SHA-256: bd0bd048d9c74d656704e785fe890123516104d4fa092a03c52418cf3d7c92f9
120 Risk Score

Malware Insights

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

The PDF contains a mass of external links, many pointing to benign content, but one critical link directs to a known malicious redirector. The document body, though heavily obfuscated, contains the text 'Directory commands in linux pdf' and the malicious URL, suggesting a lure to trick users into clicking the malicious link. The presence of numerous links, including the malicious one, indicates a link farm strategy to obscure the final destination.

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.cc/pify?keyword=directory+commands+in+linux+pdf
    • http://files.thehearttoserve.org/uploads/1/3/1/4/131454034/dafoxamepituz.pdf
    • http://files.mellifluousencapsulation.com/uploads/1/3/1/1/131163579/3845b7.pdf
    • http://bipil.chartercitytoronto.ca/uploads/1/3/0/7/130775045/a6186f5b28.pdf
    • http://files.matharteducation.org/uploads/1/3/0/8/130874400/ef1a27fc26e4.pdf
    • http://files.littlebearlabradors.com/uploads/1/3/1/4/131453121/dikefet_garubobirokez.pdf
    • https://cdn.shopify.com/s/files/1/0451/0508/6616/files/adjectives_worksheet_grade_8.pdf
    • https://cdn.shopify.com/s/files/1/0433/5799/5160/files/49676300325.pdf
    • https://cdn.shopify.com/s/files/1/0435/5247/3252/files/91272328123.pdf
    • https://cdn.shopify.com/s/files/1/0431/6620/4066/files/nolevedefutu.pdf
    • https://cdn.shopify.com/s/files/1/0428/1958/4166/files/63528355861.pdf
    • https://cdn.shopify.com/s/files/1/0427/9782/6207/files/nidiro.pdf
    • https://cdn.shopify.com/s/files/1/0432/0896/6301/files/kimiwadidivomupulemusolaj.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/dagezaluvonanapukinuwit.pdf
    • https://cdn.shopify.com/s/files/1/0428/7807/5036/files/53389318791.pdf
    • https://cdn.shopify.com/s/files/1/0431/7514/9719/files/vocabulary_for_ielts_free.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_off0000726c.bin
f18b438db8718ada5fdd83b0a06f82d714d66b9362593a73449959107a7935e0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x726C 5352 bytes
font_01_sfnt_off0000848c.bin
9f509aa57df90b2056db217235a9babed83c774262d033df1ff316fa27e1a486		 pdf-font-stream PDF embedded font (sfnt) at offset 0x848C 10668 bytes
font_02_sfnt_off0000a8fb.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA8FB 4324 bytes

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