Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc9b49c9691d8194…

MALICIOUS

PDF

40.8 KB Created: 2020-09-03 08:55:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 137d7bec8968ea9faee882e925dc5ad8 SHA-1: 3cc05cf4afc35ffb37d6c90f6fb7ad262916f82c SHA-256: fc9b49c9691d819497234b51a759318a1d92533c99c70bb3290ea62bd5165007
152 Risk Score

Malware Insights

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

The PDF contains embedded links that point to a known malicious redirector, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though partially corrupted, suggests a lure related to a 'Levis mens jacket size guide'. The PDF_SEO_LINK_FARM heuristic indicates a large number of outbound links, many of which are to benign-looking PDFs hosted on static.usrfiles.com, likely to mask the malicious redirector. The ML_NYX_PDF_MALICIOUS classifier strongly supports the malicious verdict.

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=levis+mens+jacket+size+guide
    • https://static.usrfiles.com/ugd/de3d83_94cb1c4a7bc6468e96635233d2a00883.pdf
    • https://static.usrfiles.com/ugd/162fe6_2b6c8580afc641409f0f064dbfa5d47f.pdf
    • https://static.usrfiles.com/ugd/d2cc1f_80de30db1efb40da8dad989bc32e01f3.pdf
    • https://static.usrfiles.com/ugd/fef806_2fb30cfc75f340bf848de16b877b4979.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/tiwimuz.pdf
    • https://cdn.shopify.com/s/files/1/0462/5170/4469/files/womawedofo.pdf
    • https://cdn.shopify.com/s/files/1/0438/3490/0642/files/33607187958.pdf
    • https://cdn.shopify.com/s/files/1/0434/7317/4693/files/classical_piano_music_book.pdf
    • https://cdn.shopify.com/s/files/1/0436/0408/2851/files/ffxv_garuda_event_guide.pdf
    • https://static.usrfiles.com/ugd/33a16d_e5d44719feff4471854018dc92b19d66.pdf
    • https://static.usrfiles.com/ugd/83e24f_0a6ea09527754136a3c57bbdc82dc17a.pdf
    • https://static.usrfiles.com/ugd/a2ebd8_e8e87669666849d9b5873e6a3dbe1536.pdf
    • https://static.usrfiles.com/ugd/26481d_3393ddcf9d824b959f52287758e4c79a.pdf
    • https://static.usrfiles.com/ugd/1df9ea_f367b8eba1024e678f408f1b6cf7cb0f.pdf
    • https://static.usrfiles.com/ugd/5b9365_8a512f3464f342c1bd3732827b41f9c6.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_off00005c55.bin
2b94984cd49fb4a3b028cac95499af9a1a00aed2e3a5b2258d7462682a92a105
pdf-font-stream PDF embedded font (sfnt) at offset 0x5C55 5324 bytes
font_01_sfnt_off00006e7c.bin
deca43062508330e2f573d3cd0f44d1b2984d117590f2cdd0630b35c57847cba
pdf-font-stream PDF embedded font (sfnt) at offset 0x6E7C 12732 bytes