Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a66d141285a10a9…

MALICIOUS

PDF

36.1 KB Created: 2020-08-16 22:59:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c0f23cb1e96085c22491c689985437b5 SHA-1: dda46c8a2c49a321738cab09b69ac676326e8f81 SHA-256: 4a66d141285a10a9f8d1d632a78feec555b7e7ff0a9420a09a91e8538107b2b3
150 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing for a malicious redirector at 'https://ttraff.com/pify?keyword=character+types+worksheet+1+pdf'. The document body, though heavily obfuscated, contains text that suggests it is masquerading as a worksheet, likely to trick users into clicking the malicious link. The ML classifier also strongly indicated maliciousness.

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.com/pify?keyword=character+types+worksheet+1+pdf
    • http://files.selffound.net/uploads/1/3/2/3/132302711/sodikowalob_rerakovebogepuf_wulofelajeg.pdf
    • http://files.stinesfitness.com/uploads/1/3/1/6/131637306/8472244.pdf
    • http://files.benmoorestudio.com/uploads/1/3/2/6/132696104/sumatibef_dimuvubegabumaw_bomenenazipe.pdf
    • http://files.mitchelltdavey.com/uploads/1/3/0/8/130873794/bazova_ravipilosop_wexeki.pdf
    • https://cdn.shopify.com/s/files/1/0431/9612/1248/files/come_aggiornare_app_su_android.pdf
    • https://cdn.shopify.com/s/files/1/0432/8570/8968/files/59985078746.pdf
    • https://cdn.shopify.com/s/files/1/0436/9632/4761/files/81684422739.pdf
    • https://cdn.shopify.com/s/files/1/0434/3624/5142/files/bitaso.pdf
    • https://cdn.shopify.com/s/files/1/0436/0631/1070/files/dasadinozuxe.pdf
    • https://cdn.shopify.com/s/files/1/0429/7916/4314/files/pajuge.pdf
    • https://cdn.shopify.com/s/files/1/0434/6917/6985/files/319051996.pdf
    • https://cdn.shopify.com/s/files/1/0431/1767/4656/files/hemorrhagic_cerebrovascular_event.pdf
    • https://cdn.shopify.com/s/files/1/0434/0459/1271/files/25916344810.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_off00005099.bin
a6e8cd4e54172c382e6741242b2cdf8a910728e72ae545c18f97ebf818a1ae99		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5099 5424 bytes
font_01_sfnt_off00006320.bin
49693c992e803be2646d6ec757acf281016ac07594b9ef3c2d06c6ca8a26ce95		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6320 9852 bytes

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