Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf5c3a581f2c40dc…

MALICIOUS

PDF

50.7 KB Created: 2020-09-01 01:41:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bbdee4ead8c03271ff584765194f8075 SHA-1: 9ac2552dc2c82b65cd91ee5260dbcc16efc9adcf SHA-256: cf5c3a581f2c40dc6f311bfbd5e73b66467245c2a2d47c754c8042191b15d72e
150 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 a link farm designed to redirect users to malicious content. The primary malicious URL identified is ttraff.ru, which is flagged as a redirector. The document body, though partially corrupted, contains text related to 'Aviso prévio proporcional e reforma trabalhista' and includes the malicious URL, suggesting a lure to trick users into clicking the link.

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.ru/wix?keyword=aviso+pr%25C3%25A9vio+proporcional+e+reforma+trabalhista
    • https://static.usrfiles.com/ugd/6924eb_eb1894dad1a14d8189099cb0e4374d97.pdf
    • https://static.usrfiles.com/ugd/3649d2_0de48132c81b44489cbf4c3ea1bde327.pdf
    • https://static.usrfiles.com/ugd/286fb8_4b0b120770da4f92bbf0eb84cddf34ea.pdf
    • https://static.usrfiles.com/ugd/83b1b3_7d5792d4dc3d4f72b17c62b0d1f625c8.pdf
    • https://static.usrfiles.com/ugd/6cfc61_5f747ca93a174b1daef70600561d41f1.pdf
    • https://static.usrfiles.com/ugd/277b62_c84d39925c3c437ea888d10f21e673d6.pdf
    • https://static.usrfiles.com/ugd/b8c837_16479d6eafdc437fa583bb2210179fda.pdf
    • https://static.usrfiles.com/ugd/8ab72e_f1646142f82146f5a5e36ff0cc062075.pdf
    • https://static.usrfiles.com/ugd/b8c837_dc4e1d3c30f24c46a999aafbd0482c6e.pdf
    • https://static.usrfiles.com/ugd/5fd5c1_5ad880e0598740fab889ab863112ed9a.pdf
    • https://static.usrfiles.com/ugd/49be48_7288db8ae9994f78b0a1121738f11859.pdf
    • https://cdn.shopify.com/s/files/1/0437/1821/3797/files/81191729873.pdf
    • https://cdn.shopify.com/s/files/1/0433/3663/0422/files/physics_of_semiconductor_devices_sze.pdf
    • https://cdn.shopify.com/s/files/1/0430/6337/8081/files/drools_rule_templates.pdf
    • https://cdn.shopify.com/s/files/1/0432/3511/5175/files/tewupojufedanizemez.pdf
    • https://cdn.shopify.com/s/files/1/0439/3828/3678/files/antrenmanlarla_matematik_1.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_off000080dd.bin
f02f1b434287cffbdc16637fb5347ba808b84fb1cbb608ba2d0e0c3dc4b403d4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x80DD 5588 bytes
font_01_sfnt_off00009378.bin
d035d254c908b8d0ffd0d242989c217869e7761869d3bcf5d257efb4757e259c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9378 12952 bytes

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