Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9ef374c4d55a018…

MALICIOUS

PDF

43.1 KB Created: 2020-08-09 03:15:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 040502133b7c57faad94637843c17d1c SHA-1: 5749caca6bc88d3c355a1ab0fa75b611ee201345 SHA-256: a9ef374c4d55a0186fb9fd3429a6f3f3f636ef423b961d7d69e55acadaf8ab36
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.com. The document body, though heavily obfuscated, contains the same URL and references educational content, suggesting a lure. The PDF also contains a large number of external links, many pointing to Shopify, which is flagged as a link farm. The primary malicious IOC is the ttraff.com redirector URL.

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/pify?keyword=wordly+wise+3000+book+8+lesson+9+test+pdf
    • http://files.bombersouth.com/uploads/1/3/1/3/131398498/3509327.pdf
    • http://files.akirafukui.com/uploads/1/3/0/8/130813755/wibebakak.pdf
    • http://files.carolinefineart.org/uploads/1/3/0/9/130969472/2c4da5239f65cf.pdf
    • http://files.yogainthelibrary.com/uploads/1/3/1/3/131380445/tizopijesez_kesedufudinar_lugilere.pdf
    • http://bonowoki.tgmarketingbelize.com/uploads/1/3/1/6/131606490/tokadiwewopadudaxi.pdf
    • https://cdn.shopify.com/s/files/1/0437/6756/2394/files/23093445109.pdf
    • https://cdn.shopify.com/s/files/1/0437/8954/9729/files/british_council_reading_practice.pdf
    • https://cdn.shopify.com/s/files/1/0428/5900/4070/files/alcatel_a3_xl_manual.pdf
    • https://cdn.shopify.com/s/files/1/0434/3182/1468/files/s_catalog_4chan.pdf
    • https://cdn.shopify.com/s/files/1/0435/1292/2264/files/mirubukilireroso.pdf
    • https://cdn.shopify.com/s/files/1/0435/7835/9967/files/konugevafavoraga.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/kilezolesosobusafo.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/zetuvoveluganimuwejipas.pdf
    • https://cdn.shopify.com/s/files/1/0431/2694/7989/files/gezif.pdf
    • https://cdn.shopify.com/s/files/1/0434/5564/3813/files/jakikivikuzore.pdf
    • https://cdn.shopify.com/s/files/1/0436/0388/6238/files/47566697140.pdf
    • https://cdn.shopify.com/s/files/1/0428/4389/8019/files/zeluwukomek.pdf
    • https://cdn.shopify.com/s/files/1/0427/9477/8791/files/nivuvarev.pdf
    • https://cdn.shopify.com/s/files/1/0438/9784/7976/files/academic_writing_skills_exercises.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_off00005bd4.bin
1faad886f7c5ad7abace02dfd45592efe6da638fa8cbd21078d758e2fcacfc33		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5BD4 5680 bytes
font_01_sfnt_off00006f4d.bin
efd6c3ff8621f6cf90a07efebe182a0abc1173b42da6cf5e7b176d4c9d80829f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F4D 9884 bytes
font_02_sfnt_off000090dc.bin
7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71		 pdf-font-stream PDF embedded font (sfnt) at offset 0x90DC 4324 bytes

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