Malicious PDF — malware analysis report

Static analysis result for SHA-256 b15838ae3b196784…

MALICIOUS

PDF

52.9 KB Created: 2020-08-08 02:13:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fba6fbaea7760dc3392cb8f9cf6aa5ce SHA-1: e26fbb9c4223d0dbbd6d2f3289f6cb8c45bffb85 SHA-256: b15838ae3b196784556ae41fe61a1fcb03d50d899cc395507fd852eaeefd090f
152 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'. Additionally, it features a large number of embedded links to external PDFs hosted on Shopify, suggesting a link farm or SEO poisoning tactic. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains the same malicious URL, reinforcing the intent to redirect users. No scripts were extracted, but the primary attack vector appears to be the malicious redirection.

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/pify?keyword=amplitude+modulation+examples+pdf
    • http://files.tohsthecenter.org/uploads/1/3/1/3/131379923/7845369.pdf
    • http://files.waltswanderings.com/uploads/1/3/2/7/132712306/5323503.pdf
    • http://files.thehonestlycleancompany.com/uploads/1/3/0/7/130775897/xebunitexe.pdf
    • https://cdn.shopify.com/s/files/1/0428/9763/7535/files/20770654841.pdf
    • https://cdn.shopify.com/s/files/1/0436/5837/9417/files/rupefikobavulovixok.pdf
    • https://cdn.shopify.com/s/files/1/0438/3621/1357/files/nesakalufumajobova.pdf
    • https://cdn.shopify.com/s/files/1/0437/4423/1575/files/gejiwazosisubiteketor.pdf
    • https://cdn.shopify.com/s/files/1/0431/8419/3696/files/wojedagopes.pdf
    • https://cdn.shopify.com/s/files/1/0431/7046/3895/files/51422937002.pdf
    • https://cdn.shopify.com/s/files/1/0433/6749/7880/files/gelemorugano.pdf
    • https://cdn.shopify.com/s/files/1/0437/6412/1752/files/nuderuvokolamozegi.pdf
    • https://cdn.shopify.com/s/files/1/0427/7927/9527/files/moxulitijizupub.pdf
    • https://cdn.shopify.com/s/files/1/0434/4433/8838/files/69585146676.pdf
    • https://cdn.shopify.com/s/files/1/0439/9041/7566/files/tutorialspoint_angular_4_download.pdf
    • https://cdn.shopify.com/s/files/1/0447/0643/1130/files/christmas_gift_ideas_for_him_2016.pdf
    • https://cdn.shopify.com/s/files/1/0437/2863/4010/files/savan.pdf
    • https://cdn.shopify.com/s/files/1/0439/0833/3736/files/93193655242.pdf
    • https://cdn.shopify.com/s/files/1/0431/3153/5524/files/17182938623.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007203.bin
03f5a944174893fd5cc58897dd529f087e50cbed92a83dea91d2092f04cae74e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7203 5148 bytes
font_01_sfnt_off00008372.bin
d915b4c88dfdf60cdb32956bab26f2e5031be282031ae5e7e96d84eb7a97fb75		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8372 1596 bytes
font_02_sfnt_off00008b8a.bin
91a359351c951ae0c0d5c262595fe1925e53f27f65bee97f376183d31433b26d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8B8A 10572 bytes
font_03_sfnt_off0000af5d.bin
5d8d726b7924626b6582eab718e65b9af01522c6da373b3dbc646370f5c181f4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAF5D 16400 bytes

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