Malicious PDF — malware analysis report

Static analysis result for SHA-256 512a5cf9cf36cefd…

MALICIOUS

PDF

38.0 KB Created: 2020-08-08 14:59:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b08bfe3d0d5c59337a10076fd4df44ea SHA-1: 71c55a043d7df894ee12a805eb211a4237591578 SHA-256: 512a5cf9cf36cefdbea966e4c16a1d5a788f9ccc79903ecca4d84171206ba2bc
150 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, with one specifically identified as a malicious redirector. The heuristic firings indicate a PDF link farm, likely intended to manipulate search engine results or redirect users to malicious sites. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the extensive link farm and malicious redirector are sufficient indicators of malicious intent.

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=bear+scout+leader+handbook+pdf
    • http://files.woofgangkennels.com/uploads/1/3/1/6/131637896/0621e795e0f4ba9.pdf
    • http://files.belgravia-landed.com/uploads/1/3/1/3/131384771/4112181.pdf
    • http://wikex.powermoneywomen.com/uploads/1/3/1/4/131438216/8283150.pdf
    • http://files.emilyeaglin.com/uploads/1/3/1/3/131384281/5571777.pdf
    • http://files.backcountryexplorers.com/uploads/1/3/0/7/130775934/vevewadimawukasomox.pdf
    • https://cdn.shopify.com/s/files/1/0433/1785/4373/files/trastorno_del_espectro_autista_de_alto_funcionamiento.pdf
    • https://cdn.shopify.com/s/files/1/0438/6793/0789/files/b._sc_2nd_year_maths_book.pdf
    • https://cdn.shopify.com/s/files/1/0435/0954/7174/files/fepexawemugepiripapin.pdf
    • https://cdn.shopify.com/s/files/1/0436/1804/2018/files/fedivovot.pdf
    • https://cdn.shopify.com/s/files/1/0429/7077/5706/files/business_plan_for_seafood_restaurant.pdf
    • https://cdn.shopify.com/s/files/1/0432/0998/2107/files/sigirazu.pdf
    • https://cdn.shopify.com/s/files/1/0431/2930/7287/files/73310433424.pdf
    • https://cdn.shopify.com/s/files/1/0440/2990/2998/files/lodedufakufumizinifalu.pdf
    • https://cdn.shopify.com/s/files/1/0429/6130/5756/files/40468269173.pdf
    • https://cdn.shopify.com/s/files/1/0429/7526/4919/files/10014803086.pdf
    • https://cdn.shopify.com/s/files/1/0438/0911/2226/files/95173602600.pdf
    • https://cdn.shopify.com/s/files/1/0450/0973/1734/files/jspdf_autotable_download.pdf
    • https://cdn.shopify.com/s/files/1/0428/1437/4054/files/67530807742.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_off00005540.bin
f2f238dda9a84eb3a2b8a61a5d8619b261413d9b3124f11455a4d06d029d8a5b
pdf-font-stream PDF embedded font (sfnt) at offset 0x5540 5496 bytes
font_01_sfnt_off000067de.bin
059af9ba8e7e20ac6482d7974892f2bae6b0812214d1568012f5f360afc2d069
pdf-font-stream PDF embedded font (sfnt) at offset 0x67DE 10212 bytes