Malicious PDF — malware analysis report

Static analysis result for SHA-256 22b5b68187b61b4d…

MALICIOUS

PDF

48.9 KB Created: 2020-09-01 15:53:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b1926861e77dea76fa5182cce67d264e SHA-1: 53899752ba603104ef3f83c47668a177aa58c8c9 SHA-256: 22b5b68187b61b4d93d0b87b7da59e6dfa9909793828287264f9e96392eedcdf
150 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, with a critical heuristic firing indicating a link to known malicious redirector infrastructure. The document body, though partially corrupted, contains text referencing 'Apiculture pdf book' and the malicious URL, suggesting a lure. The ML classifier also strongly flagged this PDF as malicious. The primary attack vector appears to be directing users to a malicious site via embedded links.

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/wix?keyword=apiculture+pdf+book
    • https://static.usrfiles.com/ugd/405339_1089bd8404134919bb485bec2cac2bd3.pdf
    • https://static.usrfiles.com/ugd/5ed537_10d4e956e01c47c38c28d2f9a9ccacbf.pdf
    • https://static.usrfiles.com/ugd/b8c837_ecca9774b4e14120a00f63ae7b267244.pdf
    • https://cdn.shopify.com/s/files/1/0432/5107/3174/files/40845006779.pdf
    • https://cdn.shopify.com/s/files/1/0431/1161/2572/files/diwezupalega.pdf
    • https://cdn.shopify.com/s/files/1/0432/2358/0831/files/nadi_astrology_books_in_tamil.pdf
    • https://cdn.shopify.com/s/files/1/0438/2756/0610/files/ronamatel.pdf
    • https://cdn.shopify.com/s/files/1/0438/1887/7085/files/cds_exam_syllabus_and_pattern.pdf
    • https://cdn.shopify.com/s/files/1/0434/0046/2501/files/ferabije.pdf
    • https://cdn.shopify.com/s/files/1/0431/7328/1948/files/paypal_confirmation_bank_account.pdf
    • https://static.usrfiles.com/ugd/5ad03d_6e6cc9228f51431a864e8aee5f26ab6a.pdf
    • https://static.usrfiles.com/ugd/3ab5ed_2eaf970f49854c3c9ad1495121a52745.pdf
    • https://static.usrfiles.com/ugd/9374a7_92c1f27958ba4826aff2751c80e57d24.pdf
    • https://static.usrfiles.com/ugd/6846fe_bd70cefd85e742f8ba6d66c2a6a762cb.pdf
    • https://static.usrfiles.com/ugd/9f6a24_491bb63e4c9c44edb858a3cfdb798f00.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_off0000825f.bin
aef9a2f03c724309be1993e26439861132d3bcb5ab93a1fbffcfd75b446c3f5b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x825F 4956 bytes
font_01_sfnt_off0000934a.bin
98b231a80e3b4ce6cfe706fdb0d6b130736df2dd951e041e94b0b73544ff4d4e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x934A 10408 bytes

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