Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bb3796d48fe9d34…

MALICIOUS

PDF

40.5 KB Created: 2020-07-30 19:13:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8884b2213b10aff59ae37c8331f508af SHA-1: 4dcc35ecd0030d53dd7df6a8164a13cbe777f961 SHA-256: 4bb3796d48fe9d342a6f32c3448446ea5e8279ce270e26cb783a15ba54253c65
120 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to a redirector service (ttraff.ru) and are presented as educational material. This suggests a phishing or scam attempt designed to lure users to malicious sites. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK and PDF_SEO_LINK_FARM strongly indicate this malicious intent.

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/pify?keyword=simple+present+tense+and+simple+past+tense+worksheet+pdf
    • http://files.harmitasingh.com/uploads/1/3/1/3/131381078/b51ecd43.pdf
    • http://files.risikat.com/uploads/1/3/2/6/132696112/053a0f59a.pdf
    • http://files.jaxjacobsen.com/uploads/1/3/1/3/131398338/9240238.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/xikosimuzewenox.pdf
    • https://cdn.shopify.com/s/files/1/0437/1313/4757/files/38721626793.pdf
    • https://cdn.shopify.com/s/files/1/0431/3900/6615/files/guresixi.pdf
    • https://cdn.shopify.com/s/files/1/0431/0623/8613/files/47662328594.pdf
    • https://cdn.shopify.com/s/files/1/0430/6200/1825/files/25554344919.pdf
    • https://cdn.shopify.com/s/files/1/0434/1402/8444/files/xalumakawenupivabiwibab.pdf
    • https://cdn.shopify.com/s/files/1/0432/0644/3163/files/8879715144.pdf
    • https://cdn.shopify.com/s/files/1/0429/5698/0377/files/tegifake.pdf
    • https://cdn.shopify.com/s/files/1/0430/4008/0021/files/54835164726.pdf
    • https://cdn.shopify.com/s/files/1/0431/2930/7293/files/tisuxubomelene.pdf
    • https://cdn.shopify.com/s/files/1/0432/0644/3163/files/97847229230.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/
    • https://cdn.shopify.com/s/files/1/0430/6200/1825/files/25

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005ea4.bin
5a07ee01c6cad0d62dbfb8e40a66d13123d536226baee1a8d07bdca1415352a0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5EA4 5328 bytes
font_01_sfnt_off00007096.bin
483340be0603dd1fd1b92124da8a63f6c30500236304efa62c095be9c3a65ae5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7096 10524 bytes

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