Malicious PDF — malware analysis report

Static analysis result for SHA-256 1759a5778362f26c…

MALICIOUS

PDF

35.0 KB Created: 2020-09-02 01:01:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8892fadd715ae6f7a18a9f61dfb0258f SHA-1: fe4e3bb0e048c78161773422a5227dd9731571b8 SHA-256: 1759a5778362f26c91518c3ed77eb0b14abb7fc5a500668b195f72d9f5f97aad
154 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link pointing to 'ttraff.com'. This URL is presented in the document body, likely as a lure for users to download a fake application. The PDF also contains a large number of links to other PDFs, suggesting a link farm or SEO poisoning attempt. 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.com/wix?keyword=du+battery+saver+power+doctor+apk
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0447/3182/6325/files/mastering_the_swing_trade.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/zavokalozetaxolemo.pdf
    • https://cdn.shopify.com/s/files/1/0431/7786/9476/files/purududugiwewovoneturam.pdf
    • https://cdn.shopify.com/s/files/1/0431/3602/4742/files/20109310736.pdf
    • https://cdn.shopify.com/s/files/1/0434/6091/9446/files/transformers_animated_autobots.pdf
    • https://cdn.shopify.com/s/files/1/0448/1312/3745/files/breviario_del_caos.pdf
    • https://static.usrfiles.com/ugd/0d002d_6cef98d945b945349e9fe0526d5599af.pdf
    • https://static.usrfiles.com/ugd/bb13a2_ae8c24670a3a48299510df73a3a19198.pdf
    • https://static.usrfiles.com/ugd/704988_1d27ffac542d40d6b53e2d19f3eb6809.pdf
    • https://cdn.shopify.com/s/files/1/0435/5850/2563/files/go_kart_manual_clutch.pdf
    • https://cdn.shopify.com/s/files/1/0435/4480/5525/files/45788843032.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_off0000463d.bin
ed6f346b29f9f947edd9864fab29fdcdc8f4089266e6360c04ea265152e6ad13
pdf-font-stream PDF embedded font (sfnt) at offset 0x463D 5492 bytes
font_01_sfnt_off00005918.bin
de6e86ee95821226aceb533b83b66772e80947d9f1d43d8e90e235536c98a8f2
pdf-font-stream PDF embedded font (sfnt) at offset 0x5918 12316 bytes