Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a8a9282181abeed…

MALICIOUS

PDF

48.6 KB Created: 2020-08-30 23:31:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a7948dc59a4e3c2cb62ee604f5c47f1c SHA-1: 067d8a0419d19dc1b533b50493be104bc033fa79 SHA-256: 1a8a9282181abeed2ff2151800b85c4bd81afa05f0c45581b48bf3ca65d0961e
150 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'. Additionally, it exhibits characteristics of a PDF link farm, with numerous external links, many hosted on Shopify. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains the target URL, suggesting a lure to a malicious site.

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.ru/wix?keyword=league+of+angels+fairy+guide
    • https://cdn.shopify.com/s/files/1/0431/7259/3832/files/wibizemotesewitugiwo.pdf
    • https://cdn.shopify.com/s/files/1/0435/3631/8616/files/31485175267.pdf
    • https://cdn.shopify.com/s/files/1/0437/7070/8129/files/op_amp_circuit_design.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/sabam.pdf
    • https://cdn.shopify.com/s/files/1/0431/8353/8331/files/tawopinuzovikakisaxapot.pdf
    • https://cdn.shopify.com/s/files/1/0438/7880/9755/files/letter_format_for_promotion_in_job.pdf
    • https://cdn.shopify.com/s/files/1/0433/2729/1544/files/43576718603.pdf
    • https://cdn.shopify.com/s/files/1/0432/7142/2102/files/liwolefujukejuzanumib.pdf
    • https://static.usrfiles.com/ugd/b8c837_a1c8e0aa06f8420399027d1e12471151.pdf
    • https://static.usrfiles.com/ugd/b8c837_a7980357f7b346768abc43f292b356c5.pdf
    • https://static.usrfiles.com/ugd/b8c837_d92aa52cccf84597ad2fa646c5c5e406.pdf
    • https://static.usrfiles.com/ugd/a2c2bc_a92458f6de854b6daf2935ac341d46c3.pdf
    • https://cdn.shopify.com/s/files/1/0432/2004/1886/files/mapebinadapakizolifik.pdf
    • https://cdn.shopify.com/s/files/1/0435/8055/5419/files/dorujugemugisij.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_off00007f9f.bin
da8d9c45f5145d9cec91d42bc95ab693e03781aa6e3d0cd1885abb0562e62814		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7F9F 5120 bytes
font_01_sfnt_off00009126.bin
609de466b38e1e3f798908ebabd9d0cd45359ae594ce8f09e8d4653f84ba86cf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9126 10636 bytes

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