Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd21d20a8fff856b…

MALICIOUS

PDF

44.4 KB Created: 2020-08-26 03:37:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a9eca4f41a300cf54604bb6a7af6234b SHA-1: dc74c4132b82cfe5456849602f9fca43f59c443e SHA-256: fd21d20a8fff856bdbb3f323fca98bcc314ca6c2342b5b82c9af37bf878f8aa8
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link T1059.001 PowerShell

The PDF contains numerous embedded links, with one critical heuristic identifying a link to known malicious redirector infrastructure. The document body, though partially corrupted, contains text related to 'how to write a business research proposal pdf' and an embedded URL pointing to the same topic. This suggests a social engineering lure to trick users into clicking the malicious link. The presence of multiple Shopify URLs, while mostly benign, is likely part of a link farm to improve SEO for the malicious redirector.

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=how+to+write+a+business+research+proposal+pdf
    • http://files.theskinpod.co.uk/uploads/1/3/1/8/131856042/8c7dd.pdf
    • https://cdn.shopify.com/s/files/1/0430/0016/8597/files/pepeb.pdf
    • https://cdn.shopify.com/s/files/1/0431/3530/3831/files/93746077924.pdf
    • https://cdn.shopify.com/s/files/1/0440/5752/6437/files/wufume.pdf
    • https://cdn.shopify.com/s/files/1/0437/6251/6122/files/yakitori_menu_guide.pdf
    • https://cdn.shopify.com/s/files/1/0433/9495/7466/files/37247162836.pdf
    • https://cdn.shopify.com/s/files/1/0433/6487/6453/files/minecraft_seeds_pocket_edition_city.pdf
    • https://cdn.shopify.com/s/files/1/0454/7248/1438/files/asian_drama_ost.pdf
    • https://cdn.shopify.com/s/files/1/0435/9153/2699/files/ririwiwavitemakoki.pdf
    • https://cdn.shopify.com/s/files/1/0437/7749/1105/files/37247932380.pdf
    • https://cdn.shopify.com/s/files/1/0433/3918/6344/files/ganpati_aarti_sangrah_marathi_download.pdf
    • https://cdn.shopify.com/s/files/1/0438/5928/0022/files/anticoagulant_preparation.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_off00006ef0.bin
6816d29be376010a64d90c97286820b5c0cbe6c37b179328f6fab5d7ae54ae2d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6EF0 5436 bytes
font_01_sfnt_off0000816b.bin
8f8aae14057d0bbf480735cc91f7751cffbe155ec0828680cbda16fcdae6aa93		 pdf-font-stream PDF embedded font (sfnt) at offset 0x816B 10444 bytes

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