Malicious PDF — malware analysis report

Static analysis result for SHA-256 f50f828823ffcd24…

MALICIOUS

PDF

39.6 KB Created: 2020-08-22 10:19:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b8bc4fd5513c9408f633ebdee43f5e78 SHA-1: b7beaf5ea59f8939f7ed85712c7cb9ab8a07f5a3 SHA-256: f50f828823ffcd24d95fad7f31f34c02fa2f6465e848659ca5c67666c5c1b283
150 Risk Score

Malware Insights

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

The PDF file exhibits characteristics of a link farm, embedding a significant number of external links, many of which are hosted on cdn.shopify.com. One critical heuristic identified a link to a known malicious redirector at 'https://ttraff.cc/pify?keyword=cnc+arduino+software'. The ML classifier also strongly indicated maliciousness. The document body contains obfuscated text and URLs, suggesting an attempt to obscure the malicious intent, which appears to be SEO manipulation and user redirection.

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.cc/pify?keyword=cnc+arduino+software
    • http://files.harveystringduo.com/uploads/1/3/1/6/131607712/samidatogabi.pdf
    • http://files.davenportband.com/uploads/1/3/1/4/131438299/7266350.pdf
    • http://numuwulir.information4felons.com/uploads/1/3/2/6/132695601/sexulotarawu.pdf
    • https://cdn.shopify.com/s/files/1/0430/7949/9940/files/export_bookmarks_chrome.pdf
    • https://cdn.shopify.com/s/files/1/0439/8641/9870/files/59826555664.pdf
    • https://cdn.shopify.com/s/files/1/0439/6944/6046/files/bitcoin_billionaires.pdf
    • https://cdn.shopify.com/s/files/1/0438/1641/9488/files/environmental_risk_assessment_report_sample.pdf
    • https://cdn.shopify.com/s/files/1/0430/5344/9367/files/somixedabarunemeguxeg.pdf
    • https://cdn.shopify.com/s/files/1/0438/0390/2112/files/on_the_road_by_jack_kerouac.pdf
    • https://cdn.shopify.com/s/files/1/0433/1434/8197/files/84617133736.pdf
    • https://cdn.shopify.com/s/files/1/0435/5240/7704/files/printable_check_register.pdf
    • https://cdn.shopify.com/s/files/1/0429/3325/6345/files/tolagomajamafama.pdf
    • https://cdn.shopify.com/s/files/1/0427/6004/4710/files/network_marketing_strategies.pdf
    • https://cdn.shopify.com/s/files/1/0434/7461/6472/files/proof_by_contrapositive_examples.pdf
    • https://cdn.shopify.com/s/files/1/0430/8759/3632/files/used_android_phones_for_sale_near_me.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_off00005d8a.bin
12e90e1ec4a556b76759b5b1395c50d6bdcc8915ddf550cbab9b8f08223e36aa
pdf-font-stream PDF embedded font (sfnt) at offset 0x5D8A 4980 bytes
font_01_sfnt_off00006e8d.bin
636bd980cc63699ade913ae0bac6eac84a3de13d9143ab9b1cfb126176250cd2
pdf-font-stream PDF embedded font (sfnt) at offset 0x6E8D 10256 bytes