Malicious PDF — malware analysis report

Static analysis result for SHA-256 f139b555c64691d1…

MALICIOUS

PDF

61.6 KB Created: 2020-10-25 11:23:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-12-25
MD5: 51ca589b30c056f095d0cdd0c387ad43 SHA-1: 63641410a485d0146a26af484d82f549c2b8fbf9 SHA-256: f139b555c64691d1a36f9406fca84c96605e893359d7ab58439f2efdded4991b
194 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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 lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://gettraff.ru/123?keyword=sql+cheat+sheet+oracle+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4416144/normal_5f94fce96440d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374848/normal_5f9239b5832b8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379231/normal_5f92f015e2fb1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369793/normal_5f88badad747c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369307/normal_5f8a1fe13f39d.pdfIn PDF document text
    • https://gemaxudemaxepeb.weebly.com/uploads/1/3/1/0/131070646/kovewa.pdfIn PDF document text
    • https://pejopazuzaguwoz.weebly.com/uploads/1/3/2/8/132815183/1895c8d81e.pdfIn PDF document text
    • https://jaketomerinojox.weebly.com/uploads/1/3/4/1/134109184/823af.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384483/normal_5f8c74bc4663a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367633/normal_5f87cd8e7bab9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378404/normal_5f89f73e5fdb4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://cdn.shopify.com/s/files/1/0500/2274/4234/files/36570370453.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0495/5317/8791/files/tome_of_beasts_reddit.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/3521/4503/files/the_system_builder_5th_edition_by_xuan_nguyen.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/5144/1563/files/death_to_dorgeshuun_osrs_guide.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0488/2772/8037/files/mopofifosos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0c3e03fd-0355-4309-8f62-616e90d1b63c/nikon_9000_camera.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e3549099-6171-48d0-8c07-335433b8ab2a/16392642732.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/df71409f-b4ea-4c24-85e0-fba091077d5e/50972670232.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a9765fcd-407e-42a4-a606-49aab2676c9f/watokuvapa.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0498/6083/7575/files/88629129544.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0498/6608/0445/files/nytimes_gift_guide_food.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0500/5790/4288/files/baby_trend_jogging_stroller_wheel_parts.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0476/8992/4774/files/xulobavobosanorijiromagu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/4389/4934/files/eb_aycock_athletics.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000a298.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA298 5108 bytes
SHA-256: f99f6b504f1647bb7387da4bc6c25e09942d7c436f3fe9816f5d17759d23c358
font_01_sfnt_off0000b3fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3FD 11432 bytes
SHA-256: d38458329877a19c4a3a1079b69e66efac09ac92667ada503b503ef29f5e4807
font_02_sfnt_off0000dafa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAFA 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3