Malicious PDF — malware analysis report

Static analysis result for SHA-256 53b9bdd2ad9a03e7…

MALICIOUS

PDF

39.4 KB Created: 2020-08-08 06:26:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7379dc93aa4933f1d09458d61815e05d SHA-1: 79fcf138993523e8ef747f8f0bcfcbec9ec8ec11 SHA-256: 53b9bdd2ad9a03e758bc48ad42bc2b6062b30866e47af77e35e58c9a7708768e
120 Risk Score

Malware Insights

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

The PDF contains a mass of external links, many pointing to benign Shopify URLs, but one critical link to a known malicious redirector at `https://ttraff.cc/pify?keyword=algebraic+expression+notes+pdf`. This suggests the document is designed to redirect users to malicious content under the guise of providing academic notes. The presence of numerous links, including the malicious one, indicates a link farm strategy to potentially improve search engine ranking or distribute malicious payloads.

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=algebraic+expression+notes+pdf
    • http://files.michelleleblancshortstories.com/uploads/1/3/2/6/132681398/fosogixeboguz.pdf
    • http://files.clevelandpropshop.com/uploads/1/3/0/7/130740563/9802076.pdf
    • http://files.zardie.com.au/uploads/1/3/1/8/131856476/63a20684.pdf
    • https://cdn.shopify.com/s/files/1/0454/7497/1798/files/canon_lide_300_multiple_page.pdf
    • https://cdn.shopify.com/s/files/1/0432/5516/9179/files/73104085651.pdf
    • https://cdn.shopify.com/s/files/1/0431/3225/6407/files/fukoranivotamon.pdf
    • https://cdn.shopify.com/s/files/1/0430/9411/4453/files/ayurveda_cooking.pdf
    • https://cdn.shopify.com/s/files/1/0431/4864/0418/files/53513310079.pdf
    • https://cdn.shopify.com/s/files/1/0430/4915/6757/files/loxinekuwiwivejake.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/xazijejizamoketabuguta.pdf
    • https://cdn.shopify.com/s/files/1/0429/9925/1093/files/23681005430.pdf
    • https://cdn.shopify.com/s/files/1/0428/3459/1907/files/449221907.pdf
    • https://cdn.shopify.com/s/files/1/0437/5989/4689/files/jifukuzavo.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_off00005a2e.bin
da57c6b18b94507d1e0f3115651f455ee7964f4c2f2c230740151fcd7ba1b3c4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5A2E 5520 bytes
font_01_sfnt_off00006d08.bin
97ca36fa0d4b704018fd15ec7b4de5b145ace0dcf4c03050583a7a0a59ade0f6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6D08 10588 bytes

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