Malicious PDF — malware analysis report

Static analysis result for SHA-256 b734e72b3a228ea8…

MALICIOUS

PDF

41.4 KB Created: 2020-08-08 10:31:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f5ac187eab1b9f4ace9273ad8eefae2f SHA-1: e2ecfb5335ed88cdc590e07c2b88c8a7aad3a98d SHA-256: b734e72b3a228ea84fd8037c9f979088d8e768edee87be5c96a3974a6acd4d4b
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to Shopify domains hosting other PDFs, suggesting a link farm for SEO manipulation. One critical heuristic identified a link to a known malicious redirector, ttraff.com, which is likely the primary malicious payload delivery mechanism. The document body, though heavily obfuscated, contains the URL that triggers the redirector, indicating a social engineering lure related to 'bancassurance in zimbabwe'. No scripts were extracted from this sample.

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=bancassurance+in+zimbabwe+pdf
    • http://files.rethinkreframerelax.com/uploads/1/3/1/3/131379596/d755e75.pdf
    • http://files.mckinleylaw.net/uploads/1/3/1/4/131438583/numelu.pdf
    • http://visela.topproductcomparisons.com/uploads/1/3/0/9/130969754/nebofobobisewu.pdf
    • http://files.mattmonfettlaxcamp.com/uploads/1/3/0/9/130969356/86e975613988f.pdf
    • https://cdn.shopify.com/s/files/1/0436/9760/2713/files/sajejaga.pdf
    • https://cdn.shopify.com/s/files/1/0434/0878/5562/files/4457974180.pdf
    • https://cdn.shopify.com/s/files/1/0429/7441/2949/files/tripel_x_soundtrack.pdf
    • https://cdn.shopify.com/s/files/1/0427/9799/0055/files/25433236083.pdf
    • https://cdn.shopify.com/s/files/1/0433/9105/8083/files/89217504437.pdf
    • https://cdn.shopify.com/s/files/1/0429/9587/6003/files/giwuwepidozozimin.pdf
    • https://cdn.shopify.com/s/files/1/0428/5631/7091/files/sasagesopepopekebunasobo.pdf
    • https://cdn.shopify.com/s/files/1/0433/8555/3061/files/31088938101.pdf
    • https://cdn.shopify.com/s/files/1/0440/4235/4853/files/names_of_animals_and_their_young_ones.pdf
    • https://cdn.shopify.com/s/files/1/0434/4872/9766/files/honeywell_window_fan.pdf
    • https://cdn.shopify.com/s/files/1/0431/6132/1634/files/psychogenic_non_epileptic_seizures.pdf
    • https://cdn.shopify.com/s/files/1/0427/9956/2911/files/wojavevibuzojo.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_off00005466.bin
b17a06bf49694c1ad5879fe21a5d0b73d98bf8a9e49dc8cf42b719b6bab83c0b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5466 5292 bytes
font_01_sfnt_off00006658.bin
af42c0af56c153ca31e56f561c5743763bf7012510a4ab43eeac6a957b0ba585		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6658 10688 bytes
font_02_sfnt_off00008ac7.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8AC7 4324 bytes

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