Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad1a61366becd136…

MALICIOUS

PDF

37.5 KB Created: 2020-08-29 09:03:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 37b15b1cc52d6e2af1c389cd1fec408c SHA-1: 55343f242aeb5741f5db8891dca12141dd94b64e SHA-256: ad1a61366becd136d4e898723950c62f4c486a6a3a9c655227cfc45bb1874468
140 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a link farm designed to redirect users to potentially malicious sites. One critical heuristic identified a link to a known malicious redirector. The document body, while heavily obfuscated, contains text related to multiplication worksheets and a URL that appears to be a lure. The presence of numerous PDF links and a redirector link strongly suggests a phishing or malicious redirection attempt.

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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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/wix?keyword=3-digit+by+1-digit+multiplication+worksheets
    • https://cdn.shopify.com/s/files/1/0437/2607/8101/files/fozirulif.pdf
    • https://cdn.shopify.com/s/files/1/0440/8537/9237/files/steam_link_raspberry_pi_performance.pdf
    • https://cdn.shopify.com/s/files/1/0430/6134/6466/files/jorunuvad.pdf
    • https://static.usrfiles.com/ugd/b8c837_3743659eb6c8433fa757ec478e5318f0.pdf
    • https://static.usrfiles.com/ugd/b8c837_7623674079ae4d38a386c18a331a61c8.pdf
    • https://static.usrfiles.com/ugd/b8c837_421e14b7ca234560853dc5bebd232cee.pdf
    • https://static.usrfiles.com/ugd/b8c837_7f08fad810a54e01839bdafd1b2ee5ad.pdf
    • https://static.usrfiles.com/ugd/b8c837_f9af000aa86d462abb3dd7bdb27041ae.pdf
    • https://static.usrfiles.com/ugd/b8c837_8531fae6c78c472c9f3c122d4992102a.pdf
    • https://static.usrfiles.com/ugd/b8c837_7a38c410f2a1421f89fc2e4e7703d5b9.pdf
    • https://static.usrfiles.com/ugd/b8c837_ceddf993e4b54ec79a7a96f85822c09f.pdf
    • https://static.usrfiles.com/ugd/b8c837_6cd485b0c68a401d952a3ca991841d71.pdf
    • https://static.usrfiles.com/ugd/b8c837_3f496e21c71f4133bbef8f40766c2897.pdf
    • https://static.usrfiles.com/ugd/b8c837_3daa7cc62bae48708f7609399e071a1b.pdf
    • https://static.usrfiles.com/ugd/b8c837_e97ee4ff80f54731a293fcb86ae90ead.pdf
    • https://static.usrfiles.com/ugd/b8c837_6428d094ffd544ac8253c4fc7f9177d9.pdf
    • https://static.usrfiles.com/ugd/b8c837_46fcd9b0a21a4915936cc0e767b0b75e.pdf
    • https://static.usrfiles.com/ugd/b8c837_701b8985ac11465f8bac312c70df71e6.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_off00005204.bin
115831d2068d742d2d9b4ef57bbc543eb6f7d059403bc771b89e77e0aed16f31
pdf-font-stream PDF embedded font (sfnt) at offset 0x5204 6040 bytes
font_01_sfnt_off0000667a.bin
28dd07a89c05ceb4351f5358603837aec169d86be4aa5e55a2f703bf6c4f266f
pdf-font-stream PDF embedded font (sfnt) at offset 0x667A 10116 bytes