Malicious PDF — malware analysis report

Static analysis result for SHA-256 faa65ea088d69fae…

MALICIOUS

PDF

45.7 KB Created: 2020-09-01 04:51:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c4c98616ed4beb475426ec675c867e62 SHA-1: 399a17c6b28615abefc5ba47b81611411c723848 SHA-256: faa65ea088d69faee8f55e58b01b3d0af3f6d02ff63a7c3b9408cb658b75259f
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Phishing: Spearphishing Attachment T1204.002 Malicious File: Malicious File

The PDF file was flagged as malicious by an ML classifier and contains a significant number of embedded links, many pointing to external PDFs. One critical heuristic identified a link to known malicious redirector infrastructure at 'https://ttraff.com/wix?keyword=chef%2527+s+choice+130+knife+sharpener+manual'. The presence of a link farm suggests an attempt to manipulate search engine results or distribute malicious content through seemingly benign documents. No scripts were extracted, but the sheer volume of links and the malicious redirector indicate a high likelihood of a phishing or content-distribution attack.

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/wix?keyword=chef%2527+s+choice+130+knife+sharpener+manual
    • https://cdn.shopify.com/s/files/1/0428/3564/0487/files/tolozoretebowogowuk.pdf
    • https://cdn.shopify.com/s/files/1/0457/7643/7414/files/equate_eq_cool_mist_humidifier_instr.pdf
    • https://cdn.shopify.com/s/files/1/0427/9864/5404/files/fokedunujivezakaretuba.pdf
    • https://cdn.shopify.com/s/files/1/0440/8855/7718/files/free_texture_for_3d_max.pdf
    • https://cdn.shopify.com/s/files/1/0430/4614/2106/files/877_602_3099.pdf
    • https://static.usrfiles.com/ugd/353d00_bcb3e50784ea4745b23835b7ecfa68ac.pdf
    • https://static.usrfiles.com/ugd/b8c837_ed0f191b19e14849b3880c74daa84423.pdf
    • https://static.usrfiles.com/ugd/b8c837_17394378c2454fe4af15017234932237.pdf
    • https://static.usrfiles.com/ugd/eaf48f_e216edc4065e4546ba6fe60d6203094b.pdf
    • https://static.usrfiles.com/ugd/529dbf_adc8c660d5064aa6872145aa45d0699f.pdf
    • https://static.usrfiles.com/ugd/7baf93_fe2d1b0587ef4f62913ff74b5edc2ad6.pdf
    • https://static.usrfiles.com/ugd/221f3a_8c057d922231482880fac83f29a39505.pdf
    • https://static.usrfiles.com/ugd/b8c837_5c3f0db402aa4661add6d593c1d3be1b.pdf
    • https://static.usrfiles.com/ugd/225520_83159c680c1148589662e1630062dc08.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_off000072ee.bin
57880c719ce746871b364c06e7faff1dc0039e2737b2e97a09bd2994e33da529		 pdf-font-stream PDF embedded font (sfnt) at offset 0x72EE 5616 bytes
font_01_sfnt_off000085e9.bin
16621cb94d59140a5dce0c8c85d8a0a189d0887f242af2518f42e6fe4eec4e2e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x85E9 10580 bytes

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