Malicious PDF — malware analysis report

Static analysis result for SHA-256 a03546f7352fcc02…

MALICIOUS

PDF

35.3 KB Created: 2020-09-11 16:55:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 75b3e507ea0f3cb68d9cbe1911b127a1 SHA-1: 1653305233b9d96a4374098380af8728a8c2feb3 SHA-256: a03546f7352fcc022e19f34d1ba905d1da59e0e4fd3cfb792c17efb6ae8d54a4
120 Risk Score

Malware Insights

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

The PDF contains a mass external link farm, with many links pointing to seemingly benign PDF files, but one critical link redirects to a known malicious infrastructure. The document body, though heavily obfuscated, contains the URL https://ttraff.link/wix?keyword=biochemistry+stryer+7th+edition, suggesting a lure to download or view content related to a textbook. This indicates a likely phishing or malware distribution attempt.

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.link/wix?keyword=biochemistry+stryer+7th+edition
    • http://files.denisewilliamswrites.com/uploads/1/3/0/8/130874162/9980050.pdf
    • http://zoxusi.behindthebars.org/uploads/1/3/1/3/131380005/3785801.pdf
    • http://files.gblawns.com/uploads/1/3/1/4/131437655/tutewugoto.pdf
    • http://files.hartanahconsultants.com/uploads/1/3/1/8/131858592/ff7c7b8dab3325f.pdf
    • http://gawidejeb.gailsmithyoga.com/uploads/1/3/1/4/131406557/73ec26c7410c.pdf
    • https://static.usrfiles.com/ugd/0f1814_cd71e35aa2644630a5ffe6cb5df24916.pdf
    • https://static.usrfiles.com/ugd/d162e3_425282d6b11e4ad4bac814ecedb9b11d.pdf
    • https://static.usrfiles.com/ugd/ac72e0_a2358c467b5f476d8c7b06aa96e45c48.pdf
    • https://static.usrfiles.com/ugd/f390e7_d5a4332c413345048ea3cf9dfa8246ab.pdf
    • https://cdn.shopify.com/s/files/1/0433/3089/6026/files/10163184780.pdf
    • https://cdn.shopify.com/s/files/1/0428/7394/6275/files/63621287419.pdf
    • https://cdn.shopify.com/s/files/1/0432/4406/0839/files/xuwoxixikiziseposolev.pdf
    • https://cdn.shopify.com/s/files/1/0433/7460/8545/files/18._2_modern_evolutionary_classification.pdf
    • https://cdn.shopify.com/s/files/1/0439/7511/4910/files/39846038543.pdf
    • https://cdn.shopify.com/s/files/1/0429/3014/3395/files/pharmaceutical_excipients_list.pdf
    • https://cdn.shopify.com/s/files/1/0430/0062/7363/files/60433978848.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_off00004d8e.bin
2b85f235932c1e884d23985029c63d1e3b7671d6c3bac5e641fb25ffea5a0980		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4D8E 5168 bytes
font_01_sfnt_off00005f08.bin
47c254a56f4f2b9960923312435e35a6b79041161548f51bd1d306915b32a6bf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F08 9772 bytes

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