Malicious PDF — malware analysis report

Static analysis result for SHA-256 6690777872eb0ff3…

MALICIOUS

PDF

50.9 KB Created: 2020-09-01 07:54:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9fd187397a1bcf758661dc3071e687a3 SHA-1: 8383c131c5db730941afb7a3bad9f7fd846ff3ed SHA-256: 6690777872eb0ff3eb4e0b119532a956e30b393fb51616e140ae58dbc5b64d9f
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by multiple heuristics as malicious, including a redirector link and a link farm, suggesting an SEO poisoning attack. The embedded document body, though partially corrupted, contains text related to 'Bsc physics practical notes pdf' and a URL that leads to a malicious redirector. The primary IOC is the redirector URL, which is designed to lead users to further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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.club/wix?keyword=bsc+physics+practical+notes+pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fedorahosted.org/lohit
    • https://static.usrfiles.com/ugd/10e3af_f478474250e84c978596cab0b07f2837.pdf
    • https://static.usrfiles.com/ugd/4d935e_1056680e8bbc450ab860dc8c53d0d8b2.pdf
    • https://static.usrfiles.com/ugd/55cc32_89e5590c05cd49299c515d8e2435f06c.pdf
    • https://cdn.shopify.com/s/files/1/0431/5732/3933/files/senoda.pdf
    • https://cdn.shopify.com/s/files/1/0432/3019/9966/files/zojasuwazirujodamapuk.pdf
    • https://cdn.shopify.com/s/files/1/0428/2915/2423/files/63149308007.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/pidepuwavulosetanujerepub.pdf
    • https://cdn.shopify.com/s/files/1/0434/5951/0425/files/10904438354.pdf
    • https://static.usrfiles.com/ugd/2e16aa_f050fdea0c38474791c2e5da2382e94a.pdf
    • https://static.usrfiles.com/ugd/b8c837_4894bbb1a51b432d995f3a6f5d64b0ce.pdf
    • https://static.usrfiles.com/ugd/b6edda_b395cc65806745ca985db7d7540f46a0.pdf
    • https://static.usrfiles.com/ugd/87d215_0586368cc82b45de83afd18caee2571a.pdf
    • https://static.usrfiles.com/ugd/6cfc61_3f05ceec11c14e89af2555f1b52ca4a8.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/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005b88.bin
fea43484986855f782667860c6cd1f78dc2f771a3db7ab4228dae910e69cce2e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5B88 5396 bytes
font_01_sfnt_off00006de5.bin
35c0a746fcdf55e64f2ba55209f6a139fa5d4ea47dce36c63c78d1e6d66b29b6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6DE5 3204 bytes
font_02_sfnt_off00007ad6.bin
d97e055e11de589539a249dfdf9c15aca1e9caf4700104d1763a3a5d87d8f7f2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7AD6 2320 bytes
font_03_sfnt_off00008528.bin
0cc1cee7a339f685af0b560dea82a4424b1998ea1492545ccfaef52475c47805		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8528 10316 bytes
font_04_sfnt_off0000a869.bin
207faf14306426b668b87aba0c9d447b8ba40b67f0f7b18660ffa0d3c8132265		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA869 16224 bytes

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