Malicious PDF — malware analysis report

Static analysis result for SHA-256 9fcabab624e2ec00…

MALICIOUS

PDF

41.8 KB Created: 2020-08-06 20:28:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b7535d55d66026792b32dac847cf3f26 SHA-1: 634c529ed4659f4cf649412fcf420601fa6d4b60 SHA-256: 9fcabab624e2ec00e3f9eadac40c454846ec2caa71594c1cc600aab2cb45935c
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains numerous embedded links, with a critical heuristic firing indicating a malicious redirector. The document body, though partially corrupted, suggests a lure related to 'worksheets'. The primary malicious URL identified is https://ttraff.com/pify?keyword=action+linking+and+helping+verbs+worksheets+pdf, which is likely used to redirect users to a malicious site. The presence of many external PDF links also suggests a link farm or SEO poisoning tactic.

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=action+linking+and+helping+verbs+worksheets+pdf
    • http://files.burmenlawgroup.com/uploads/1/3/2/3/132303378/nokinitiju.pdf
    • http://files.cailynv.com/uploads/1/3/2/6/132683017/2021550.pdf
    • http://files.shanahanagency.com/uploads/1/3/1/4/131408203/bemameviwixegu_latexetojakat_tawibupidiwido_pufixal.pdf
    • http://files.littlewingcollective.com/uploads/1/3/2/8/132814375/1097694.pdf
    • https://cdn.shopify.com/s/files/1/0434/8408/6424/files/56005100.pdf
    • https://cdn.shopify.com/s/files/1/0435/4909/8148/files/begepawisegeletim.pdf
    • https://cdn.shopify.com/s/files/1/0431/6830/1212/files/3932338363.pdf
    • https://cdn.shopify.com/s/files/1/0433/6526/9669/files/wijilefituzonabijiviluz.pdf
    • https://cdn.shopify.com/s/files/1/0432/2010/7428/files/xufabexedu.pdf
    • https://cdn.shopify.com/s/files/1/0433/6903/7974/files/kulanadojumuvuzavobegun.pdf
    • https://cdn.shopify.com/s/files/1/0431/8609/4241/files/7450652405.pdf
    • https://cdn.shopify.com/s/files/1/0438/6357/2635/files/filajawoleluzakisa.pdf
    • https://cdn.shopify.com/s/files/1/0429/8512/8099/files/mald_urban_dictionary.pdf
    • https://cdn.shopify.com/s/files/1/0436/6372/0613/files/bioconjugation_protocols_strategies_and_methods.pdf
    • https://cdn.shopify.com/s/files/1/0432/7188/0870/files/kofotapi.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_off000063f6.bin
b9fb5f41a8d3e34a6c00d68521d9ebec3a9bb6b067754b17730d507aee0bcc0e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x63F6 5764 bytes
font_01_sfnt_off000077a1.bin
18d638f3fa5608f471886299205c624db786b85901020c3c1cccb7f1d39376bc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x77A1 10072 bytes

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