Malicious PDF — malware analysis report

Static analysis result for SHA-256 939f273d97c08819…

MALICIOUS

PDF

17.6 KB Created: 2020-10-23 21:55:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9a36f5da9cc776fd8541e443d538fbd7 SHA-1: 4b3ce58f6567225e3be326c818d3d30032255ae5 SHA-256: 939f273d97c08819720fa352f25b3f1ab3c786667b369237feb98a36de051f46
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document is designed as a lure, presenting itself as an image to hide clickable links. It contains a large number of external links, including one pointing to known malicious redirector infrastructure at 'https://ggtraff.ru/strik?keyword=grammar+girl+pdf'. The document's structure and the presence of malicious links strongly suggest a phishing or redirection campaign. The ML classifier also flagged this document with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 4

  • 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.
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 17 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://ggtraff.ru/strik?keyword=grammar+girl+pdf
    • https://cdn-cms.f-static.net/uploads/4371004/normal_5f88ef27678c6.pdf
    • https://cdn-cms.f-static.net/uploads/4369138/normal_5f8a16c77a244.pdf
    • https://cdn-cms.f-static.net/uploads/4366642/normal_5f87719adabef.pdf
    • https://cdn-cms.f-static.net/uploads/4373505/normal_5f8bf12dc26ed.pdf
    • https://cdn-cms.f-static.net/uploads/4369771/normal_5f9278cecdfd9.pdf
    • https://cdn-cms.f-static.net/uploads/4368478/normal_5f8e08cda285a.pdf
    • https://cdn-cms.f-static.net/uploads/4379043/normal_5f8c8ee100ed5.pdf
    • https://cdn.shopify.com/s/files/1/0501/9490/7314/files/new_round_up_3_teachers_guide.pdf
    • https://cdn.shopify.com/s/files/1/0266/8937/2329/files/44426648427.pdf
    • https://cdn.shopify.com/s/files/1/0501/8304/5293/files/honeywell_5808w3_wireless_smoke_detector_manual.pdf
    • https://cdn.shopify.com/s/files/1/0435/3071/5288/files/der_feinschmecker_weinguide_2020.pdf
    • https://cdn.shopify.com/s/files/1/0268/7513/4135/files/from_to_word_app.pdf
    • https://cdn.shopify.com/s/files/1/0500/9306/4357/files/49007390769.pdf
    • https://cdn.shopify.com/s/files/1/0486/1794/7296/files/squat_and_gobble_west_portal.pdf
    • https://cdn.shopify.com/s/files/1/0494/5841/3735/files/8967271406.pdf
    • https://s3.amazonaws.com/degisapemifa/analytical_ability_test.pdf
    • https://s3.amazonaws.com/gurowozenupifi/la_bella_bestia_gratis.pdf
    • https://s3.amazonaws.com/wonoti/jusixamef.pdf
    • https://s3.amazonaws.com/nowokil/83836697369.pdf
    • https://s3.amazonaws.com/memul/17703908753.pdf
    • https://cdn.shopify.com/s/files/1/0492/1986/2694/files/outside_psus_new_karl_miller_center.pdf
    • https://cdn.shopify.com/s/files/1/0484/5980/8929/files/leiter_3_manual.pdf
    • https://cdn.shopify.com/s/files/1/0481/6086/6455/files/inmigracion_japonesa_al_peru.pdf
    • https://cdn.shopify.com/s/files/1/0483/6389/6995/files/chrome_moly_tubing_for_roll_cage.pdf