Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf215a6a45241608…

MALICIOUS

PDF

40.8 KB Created: 2020-08-19 11:00:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 973297d42c7bc7e72896b229cbff23fd SHA-1: 5e1f4a0e1a72c5064e2c3f8eb3ed304e3f659486 SHA-256: bf215a6a45241608cb00ae393532165c60565d09bf1399d2d5d7ea381847b62d
150 Risk Score

Malware Insights

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

The PDF document is identified as malicious due to its use of a redirector link and a large number of embedded external links, characteristic of SEO link farms. The document body, though heavily obfuscated, contains text suggesting it is an 'answer key' to lure victims. The primary malicious IOC is the redirector URL, which likely leads to further malicious content. The ML classifier strongly supports the malicious verdict.

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.cc/pify?keyword=evaluating+function+worksheet+answer+key
    • http://tojukok.bellavocesoin.com/uploads/1/3/1/0/131070450/jilomopemagotepezo.pdf
    • http://files.joy-of-syntax.com/uploads/1/3/0/7/130739747/0e877f540625.pdf
    • http://files.tailoredmuse.com/uploads/1/3/1/8/131871556/2ffae733c.pdf
    • https://cdn.shopify.com/s/files/1/0432/8331/6891/files/merlin_s_crystal_osrs.pdf
    • https://cdn.shopify.com/s/files/1/0432/2826/6654/files/kebezesawonokutuk.pdf
    • https://cdn.shopify.com/s/files/1/0429/5717/6986/files/4483983820.pdf
    • https://cdn.shopify.com/s/files/1/0434/7206/0573/files/41682152456.pdf
    • https://cdn.shopify.com/s/files/1/0434/5122/0134/files/96565902296.pdf
    • https://cdn.shopify.com/s/files/1/0430/0124/9955/files/jugusomupejowulebedela.pdf
    • https://cdn.shopify.com/s/files/1/0429/9954/6009/files/96093393282.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/wirokole.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/69296453687.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_off00006139.bin
f4299351a8b0e824150538572e1e8bb3b276bf0bfa394df16f92cdf2b7c49ae6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6139 5420 bytes
font_01_sfnt_off000073c3.bin
4925d3da49fa262e7a890ba75c3bb937b703617371cb70a6b65f190d819bf788		 pdf-font-stream PDF embedded font (sfnt) at offset 0x73C3 10240 bytes

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