Malicious PDF — malware analysis report

Static analysis result for SHA-256 35726903f0a20c3c…

MALICIOUS

PDF

52.9 KB Created: 2020-07-23 05:18:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f790e47f8ed21f56e05dbc831e7e2045 SHA-1: 661fe957f70f07586e1df874f62bd1b03a117608 SHA-256: 35726903f0a20c3cd153b59baa8e91d805f9d4c950dbe5c68f8eaed43cf4ef0b
152 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to Shopify domains, but one critical link redirects through 'ttraff.cc', a known malicious redirector. The document body, though heavily obfuscated, contains text related to financial statements, suggesting a lure. The ML classifier also strongly indicated maliciousness.

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.cc/pify?keyword=estados+financieros+pdf+que+son
    • http://files.treatsicecreamparlour.com/uploads/1/3/0/8/130814466/bc4b4a471f.pdf
    • http://files.shsbusinessclass.com/uploads/1/3/1/0/131070307/bizofafowelimafapuf.pdf
    • http://files.12monthbeauty.com/uploads/1/3/0/8/130874128/6301925.pdf
    • https://wefefusij
    • https://cdn.shopify.com/s/files/1/0430/4257/0402/files/duturinukoseze.pdf
    • https://cdn.shopify.com/s/files/1/0434/5410/3713/files/pikiwovasujik.pdf
    • https://cdn.shopify.com/s/files/1/0431/2953/6668/files/furowobafo.pdf
    • https://selijowo.files.wordpress.com/2020/07/91646726011.pdf
    • https://fudinusaxuli.files.wordpress.com/2020/07/22736481707.pdf
    • https://wefefusijuro.files.wordpress.com/2020/07/74307708870.pdf
    • https://cdn.shopify.com/s/files/1/0438/0321/3984/files/21344669576.pdf
    • https://cdn.shopify.com/s/files/1/0431/7754/1787/files/vesetejafenirubam.pdf
    • https://cdn.shopify.com/s/files/1/0430/1311/1961/files/kotuzotenafij.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/23651487672.pdf
    • https://cdn.shopify.com/s/files/1/0431/1020/3556/files/88580301433.pdf
    • https://cdn.shopify.com/s/files/1/0434/0659/0106/files/lopiso.pdf
    • https://cdn.shopify.com/s/files/1/0433/5557/0341/files/bexagebenaxajuxasobodowur.pdf
    • https://cdn.shopify.com/s/files/1/0432/1991/0820/files/xisafugoruvefata.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_off00007a2d.bin
9b47ad690252f7bb630a3a8093d55e8254e084c0ccba9862620de5948ee7b5da		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A2D 5080 bytes
font_01_sfnt_off00008b79.bin
f40e52ca862c72391370f0b9899ff53e86244cc876d7dfd0f2dc9ab3be0bbf4d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8B79 11064 bytes
font_02_sfnt_off0000af60.bin
3afbc95f4a2677bf4c8b77bd7df62e4dbeb651db4b5e482cf97b58e472170d58		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAF60 16164 bytes

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