Malicious PDF — malware analysis report

Static analysis result for SHA-256 f63d0a9aa82f1761…

MALICIOUS

PDF

34.7 KB Created: 2020-08-31 10:45:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 09f65375f25e59408b975106eebb1465 SHA-1: b4be20404c716353c28a66ecdb6ad87d61f95a30 SHA-256: f63d0a9aa82f1761ab02f296ef5f8ebc7a03dcf6af0e9d3e560ef4e734cd588b
152 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.cc, which is disguised with a product name. The document also contains a large number of embedded links to static.usrfiles.com, suggesting a link farm or SEO poisoning attempt. The ML classifier strongly indicated maliciousness. No scripts were extracted, but the primary attack vector appears to be social engineering via a malicious link.

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.cc/wix?keyword=duralast+700+peak+amps+jump+starter
    • https://static.usrfiles.com/ugd/b8c837_84ffaf7a36a94757a98a5ce6466eac04.pdf
    • https://static.usrfiles.com/ugd/824332_a53618d9d1224553a5b61b04cc9b6a91.pdf
    • https://static.usrfiles.com/ugd/8acad3_664f5203f52943149629485fc48596df.pdf
    • https://static.usrfiles.com/ugd/d775a9_dd74c7fa583340718c1c5299dff87828.pdf
    • https://static.usrfiles.com/ugd/868401_ec89412212754eda80ed820e666e63ed.pdf
    • https://static.usrfiles.com/ugd/0c4177_48f8c8c7a0344392aa6bb236e046bae2.pdf
    • https://static.usrfiles.com/ugd/b52961_1fa120d09020465ca19dba7122f04b3a.pdf
    • https://static.usrfiles.com/ugd/4f270c_56a9cf4554a64b55a9fc2ab0280fdc58.pdf
    • https://static.usrfiles.com/ugd/b8c837_1bf73c9469a149e29844297101e16ec4.pdf
    • https://static.usrfiles.com/ugd/ea2f88_4b7ab7e28aaf49e8a924ae6aee264c03.pdf
    • https://cdn.shopify.com/s/files/1/0431/8206/3777/files/62244244694.pdf
    • https://cdn.shopify.com/s/files/1/0435/5781/4421/files/senobumafoluw.pdf
    • https://cdn.shopify.com/s/files/1/0435/8592/9375/files/playboy_november_2011.pdf
    • https://cdn.shopify.com/s/files/1/0436/2820/0096/files/cessna_172p_poh.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_off00004995.bin
50e197caa79edc06aac3d0b77f35a90f543bc18c6fd5f0e2b807a0a0a8a5200e
pdf-font-stream PDF embedded font (sfnt) at offset 0x4995 5328 bytes
font_01_sfnt_off00005bb0.bin
e1d685a0bd4795a9fd99c7319dee383978150a8d9361c2e116b861ac696d316a
pdf-font-stream PDF embedded font (sfnt) at offset 0x5BB0 10064 bytes