Malicious PDF — malware analysis report

Static analysis result for SHA-256 97a5b02e29e8572a…

MALICIOUS

PDF

54.2 KB Created: 2020-08-13 01:46:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5a238cf38565b1e2511a9129ccd923e7 SHA-1: 75e1ea41b80cc3c5aa6c1304490d46f46020c0bb SHA-256: 97a5b02e29e8572a4cf6f0be219e593d1f36bb6f98e69ed36ac1c332b5604992
120 Risk Score

Malware Insights

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

The PDF file contains numerous links, a technique often used in SEO link farms to drive traffic to malicious sites. One critical heuristic identified a link to a known malicious redirector, 'ttraff.ru', which is part of a campaign to lure users with academic-sounding titles. The document body, though heavily obfuscated, contains the same URL, reinforcing the malicious intent. No scripts were extracted from this sample.

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=searching+and+sorting+algorithms+in+data+structure+pdf
    • http://files.performancebalancer.co.uk/uploads/1/3/1/0/131070469/1756663.pdf
    • http://files.provpac.com/uploads/1/3/1/4/131438046/rexenokiniru.pdf
    • http://files.hobbiesandhorses.com/uploads/1/3/0/7/130739814/bcd8f832.pdf
    • https://cdn.shopify.com/s/files/1/0434/2457/9751/files/12560731657.pdf
    • https://cdn.shopify.com/s/files/1/0436/1709/1744/files/najojatusefanajemon.pdf
    • https://cdn.shopify.com/s/files/1/0431/0463/2998/files/zozudavugadev.pdf
    • https://cdn.shopify.com/s/files/1/0437/2620/9175/files/best_osu_skin_tails.pdf
    • https://cdn.shopify.com/s/files/1/0434/7029/1096/files/95288402798.pdf
    • https://cdn.shopify.com/s/files/1/0434/2477/6354/files/noruxilow.pdf
    • https://cdn.shopify.com/s/files/1/0440/3740/6870/files/fiwofutuwavusuvad.pdf
    • https://cdn.shopify.com/s/files/1/0427/7505/2454/files/diripife.pdf
    • https://cdn.shopify.com/s/files/1/0435/6944/7073/files/65089377989.pdf
    • https://cdn.shopify.com/s/files/1/0440/4294/4677/files/trap_house_3.pdf
    • https://cdn.shopify.com/s/files/1/0432/1542/1599/files/52025881479.pdf
    • https://cdn.shopify.com/s/files/1/0435/3176/3864/files/bixej.pdf
    • https://cdn.shopify.com/s/files/1/0434/0688/5020/files/microeconomics_and_behavior_9th_edition.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_off000094d5.bin
e0cd23fbea931f0f6675c5a3d48dd3ff7eed423c32dd8b4c29836866f58e5891		 pdf-font-stream PDF embedded font (sfnt) at offset 0x94D5 5672 bytes
font_01_sfnt_off0000a7ec.bin
7419ec292170d118e0cfa3bd329509d6892bfa40293d29cbfa2cc36b25e68333		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA7EC 10540 bytes

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