Malicious PDF — malware analysis report

Static analysis result for SHA-256 831a5ac8108ae328…

MALICIOUS

PDF

43.2 KB Created: 2020-08-31 23:49:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b73c482cf473f21859a1f3ba15b2a6c8 SHA-1: fe9d24f128d79228c206a8c1fed89a8269773714 SHA-256: 831a5ac8108ae328915c573d2facc9ac5f3bb6bad1ebdc55d2bda2c453c07618
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a link farm designed to redirect users to malicious infrastructure, specifically identified by the heuristic PDF_MALICIOUS_REDIRECTOR_LINK. The primary malicious URL is https://ttraff.com/wix?keyword=mortgage+loan+commitment+letter+template. The document body, though heavily obfuscated, contains this URL, suggesting a social engineering lure related to loan documents. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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.com/wix?keyword=mortgage+loan+commitment+letter+template
    • https://static.usrfiles.com/ugd/33ab24_953459ca8c9545b59213b40d2fa57e17.pdf
    • https://static.usrfiles.com/ugd/b8c837_7fb9aedc51804b0da9bd5ac73ec33ef4.pdf
    • https://static.usrfiles.com/ugd/913720_e128ee6cd0394b51b998024642541dba.pdf
    • https://static.usrfiles.com/ugd/9e53d4_0d5f51d7b1c344219fd6cc661f530240.pdf
    • https://cdn.shopify.com/s/files/1/0432/7889/3214/files/86655341854.pdf
    • https://cdn.shopify.com/s/files/1/0433/4403/5993/files/analogies_list.pdf
    • https://cdn.shopify.com/s/files/1/0437/9354/7426/files/13443909856.pdf
    • https://static.usrfiles.com/ugd/b8c837_946623de2c8d4ae1bfa3c9e658859ce4.pdf
    • https://static.usrfiles.com/ugd/b8c837_d81d96009fc34348a52a7f4357d28a81.pdf
    • https://static.usrfiles.com/ugd/3fc21f_5876e6f73e6f4ac99a817df6e015b174.pdf
    • https://static.usrfiles.com/ugd/f0e51d_1ea8ddef8ab44378be13060120f5ff5e.pdf
    • https://static.usrfiles.com/ugd/76b6de_d56cf193eaab499bb1ca42abe8aeca7b.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005f35.bin
e8650c5c898713afd6879839cae64c77caa89729e8c4528e8e19f62fc95b3dc9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F35 4868 bytes
font_01_sfnt_off00006fa8.bin
6f74dd521a612375742637af3ac4128faa967133a6e631974528ecadf9835f11		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6FA8 9980 bytes
font_02_sfnt_off000091bf.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x91BF 4324 bytes

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