Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfe2b23ca6eef6c2…

MALICIOUS

PDF

44.7 KB Created: 2020-08-31 01:40:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2de6971631250da143bca1c903dd3958 SHA-1: f1c33c1752a0b0c213dee5b6b39c84c769830fb1 SHA-256: dfe2b23ca6eef6c2f4b4c99728e82cfc86295e9f2c6ab2495cc046f06897ade3
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'ttraff.ru'. The document body, though heavily obfuscated, also contains this URL. The presence of numerous external PDF links, many pointing to Shopify, suggests a link farm or SEO poisoning attempt to distribute malicious content. The ML classifier strongly indicates maliciousness.

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.ru/wix?keyword=don%2527t+starve+together+wickerbottom+sanity+guide
    • https://cdn.shopify.com/s/files/1/0428/5959/3894/files/1671968012.pdf
    • https://cdn.shopify.com/s/files/1/0429/5681/6540/files/tepisa.pdf
    • https://cdn.shopify.com/s/files/1/0431/1102/2756/files/fenibilugefalusi.pdf
    • https://static.usrfiles.com/ugd/b85eb0_a11c80f8143c496aa0451aa1921fb909.pdf
    • https://static.usrfiles.com/ugd/9ea9b6_8beef3f51ae2411cbb44d68e2b3b5000.pdf
    • https://static.usrfiles.com/ugd/b8c837_d5fa0a33847b48b098247d4c1699fdd5.pdf
    • https://static.usrfiles.com/ugd/b8c837_05380624090343b5bca55777ce2fa750.pdf
    • https://static.usrfiles.com/ugd/b8c837_bab4fb75bd07401dbd7e7bf39f9660f0.pdf
    • https://cdn.shopify.com/s/files/1/0429/6284/5859/files/69857780806.pdf
    • https://cdn.shopify.com/s/files/1/0437/0658/1147/files/69167955188.pdf
    • https://cdn.shopify.com/s/files/1/0441/4429/6088/files/73733169816.pdf
    • https://cdn.shopify.com/s/files/1/0435/3864/5144/files/dewidonumomemurajawotuxe.pdf
    • https://static.usrfiles.com/ugd/4bb894_f983b478bfdc4996925e98ac936fb493.pdf
    • https://static.usrfiles.com/ugd/39cb9d_933f756d8bca4de49fbbc052ce6ad828.pdf
    • https://static.usrfiles.com/ugd/b91566_3401996ac31540d6a6d0509c90aeeba7.pdf
    • https://static.usrfiles.com/ugd/d775a9_27880f0fb4d34e6a83bde89b9a429fc1.pdf
    • https://static.usrfiles.com/ugd/b8c837_4a5a2267bc9740bb8cd25fe7ebae15f5.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_off00006dce.bin
9e93925f144f6ec7b8d19fabae96956f60f22fdd0cec472aefad4044ad1d8287
pdf-font-stream PDF embedded font (sfnt) at offset 0x6DCE 5812 bytes
font_01_sfnt_off0000818e.bin
2eccdc45815c9f5e005d5a4be62d65816e8518572f49aed51b086c52af6d7955
pdf-font-stream PDF embedded font (sfnt) at offset 0x818E 10420 bytes