Malicious PDF — malware analysis report

Static analysis result for SHA-256 81ac9d8a55a4f423…

MALICIOUS

PDF

37.5 KB Created: 2020-08-31 03:21:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cbbe200471f51dd8c81aa502f68ad5e7 SHA-1: 750503853886203c70bdea40b79341b1032d204d SHA-256: 81ac9d8a55a4f4238786d39605882dad741bf80948faf9e0eaeb2757703e9d69
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to Shopify domains hosting other PDFs, but one critical link directs to a known malicious redirector. The ML classifier strongly indicates maliciousness, and the PDF structure suggests an attempt to obscure malicious intent through a link farm. The primary malicious URL is https://ttraff.me/wix?keyword=chief+keef+on+it+download.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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.me/wix?keyword=chief+keef+on+it+download
    • https:///chief-keef/a10.gaanacdn.com/images/artists/67/146867/crop_80x80_146867.jpg,objtype:4:85
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/8248/0806/files/tifarojo.pdf
    • https://cdn.shopify.com/s/files/1/0433/5288/3352/files/email_signature_template_examples.pdf
    • https://cdn.shopify.com/s/files/1/0428/3187/2166/files/behave_sapolsky_epub.pdf
    • https://cdn.shopify.com/s/files/1/0433/0471/4404/files/vuwobexolugag.pdf
    • https://static.usrfiles.com/ugd/b8c837_2e3a30113151436e925358d05a45388e.pdf
    • https://static.usrfiles.com/ugd/f3ecbe_d35b7ec7ca4f46f39c751c0a0b1a67a0.pdf
    • https://static.usrfiles.com/ugd/d4da64_5b81b021245d46edbb0049ef5577a72f.pdf
    • https://static.usrfiles.com/ugd/3794ad_bc8bc705913e40aaa2e60d91018bd117.pdf
    • https://static.usrfiles.com/ugd/1c90dc_19f823521efe4007882a586535a894bb.pdf
    • https://static.usrfiles.com/ugd/238140_b22230cecfa84708a96e4ea4cd06e0dd.pdf
    • https://static.usrfiles.com/ugd/b8c837_06be2f7c8e9b444bb602d682ebe931fd.pdf
    • https://static.usrfiles.com/ugd/b8c837_0498c0ee08044bf8bb70d73c57a1bc4a.pdf
    • https://cdn.shopify.com/s/files/1/0431/3900/6632/files/2164509687.pdf
    • https://cdn.shopify.com/s/files/1/0431/1659/3312/files/62390200784.pdf
    • https://cdn.shopify.com/s/files/1/0429/3348/5727/files/power_of_autosuggestion.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000545e.bin
90a313fb4cb90062a2874b180fada5d4155f532559839acca3c82512a8e1a07b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x545E 4784 bytes
font_01_sfnt_off000064ae.bin
57129708ffeda7178ed747415068a2ba5e24d6a9ee2ca27be6a9abbe455378d9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x64AE 10988 bytes

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