Malicious PDF — malware analysis report

Static analysis result for SHA-256 5793c1a4d1a6e5bc…

MALICIOUS

PDF

42.5 KB Created: 2020-08-26 00:51:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bb8cd1120c6079ca4174bdf15970f4db SHA-1: 1a4c9f57b2de7ba0b3e14797a88a38d17c8c631c SHA-256: 5793c1a4d1a6e5bc53d3317b8f42b29aa2fdecf658f6c35a03239662f1bb02da
128 Risk Score

Malware Insights

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

The PDF file contains a critical heuristic indicating it's a malicious redirector link, pointing to 'ttraff.ru'. This URL is part of a link farm strategy, with numerous other PDFs hosted on Shopify. The document body, though heavily obfuscated, contains the same redirector URL and a reference to 'anne marie album download', suggesting a lure for users seeking content. The presence of a 'download button' heuristic further supports the social engineering aspect of this attack.

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/pify?keyword=anne+marie+album+download
    • http://files.vpecc.com/uploads/1/3/0/7/130739312/79e22.pdf
    • https://cdn.shopify.com/s/files/1/0437/6307/3181/files/87590852831.pdf
    • https://cdn.shopify.com/s/files/1/0431/8468/5224/files/62847319262.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/nazowexoratusitufunu.pdf
    • https://cdn.shopify.com/s/files/1/0431/9523/6513/files/first_grade_math_worksheets_addition_without_regrouping.pdf
    • https://cdn.shopify.com/s/files/1/0431/6944/8096/files/51754050043.pdf
    • https://cdn.shopify.com/s/files/1/0429/3269/9302/files/bronkitis_akut_pada_anak.pdf
    • https://cdn.shopify.com/s/files/1/0435/7760/6303/files/dave_ramsey_budget_sheet_percentages.pdf
    • https://cdn.shopify.com/s/files/1/0452/4644/7776/files/benefits_of_a_rooted_android_phone.pdf
    • https://cdn.shopify.com/s/files/1/0428/0687/0183/files/momipatanoniw.pdf
    • https://cdn.shopify.com/s/files/1/0434/2834/8056/files/segar.pdf
    • https://cdn.shopify.com/s/files/1/0431/7921/2959/files/bitmap_image_into.pdf
    • https://cdn.shopify.com/s/files/1/0428/8416/9894/files/legafesipinimokupitok.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_off000068ab.bin
01f7b9bb0fda2091b4d1be29651312246c493f0a3c89861f690931da23ccd3b9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x68AB 5012 bytes
font_01_sfnt_off000079a0.bin
7517744fbccfccd658ff8342ced3e121260b7d4a6cac6f04356ca80a0bce6ab5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x79A0 10056 bytes

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