Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d1d8d0e952446a5…

MALICIOUS

PDF

42.6 KB Created: 2020-10-26 12:14:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 267e03a78779333ffbafa5b318d8a47a SHA-1: 63a81eb177a2239b091b7915a54102f01dba9391 SHA-256: 6d1d8d0e952446a5ac237c5229c2c84b71c7ba750f886ff0abd1f018255791f8
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a lure for a fake electric bill, directing users to click on a link. This link, https://gettraff.ru/123?keyword=fake+electric+bill+pdf, is flagged as a malicious redirector. The ML classifier also strongly indicated maliciousness. While no scripts were directly extracted, the PDF structure and embedded links suggest an attempt to redirect users to a malicious site, likely for phishing or malware distribution.

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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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=fake+electric+bill+pdf
    • https://cdn-cms.f-static.net/uploads/4376849/normal_5f8b4394a7762.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0486/0300/5086/files/im3_jarvis_download_apk.pdf
    • https://cdn.shopify.com/s/files/1/0499/8588/0214/files/visabosamalurumob.pdf
    • https://cdn.shopify.com/s/files/1/0435/8373/3915/files/9076759578.pdf
    • https://cdn.shopify.com/s/files/1/0438/5302/1334/files/reading_glasses_strength_test.pdf
    • https://s3.amazonaws.com/miwolezedubujoz/sedilasi.pdf
    • https://s3.amazonaws.com/jofunozuzof/mutot.pdf
    • https://uploads.strikinglycdn.com/files/a5ac659a-425d-4e5f-a2b8-7f391778c66d/41939879887.pdf
    • https://uploads.strikinglycdn.com/files/f64ec5d9-6e25-4f4d-a8a8-e3e4da2a4eb3/sentence_variety_worksheet.pdf
    • https://uploads.strikinglycdn.com/files/1e3a213b-fb53-4988-ad50-8ae674c44bb5/vekejiwisopow.pdf
    • https://uploads.strikinglycdn.com/files/018cc4a4-865b-4d02-a85f-ed632f568b99/end_time_messages.pdf
    • https://uploads.strikinglycdn.com/files/4538d39d-4cbb-4d06-acac-6518fa7f97e4/79601152640.pdf
    • https://cdn.shopify.com/s/files/1/0441/0192/7064/files/2447271564.pdf
    • https://cdn.shopify.com/s/files/1/0480/9175/8756/files/nabaduvumawebizesifixule.pdf
    • https://cdn.shopify.com/s/files/1/0433/8896/0933/files/turepopiwebipik.pdf
    • https://uploads.strikinglycdn.com/files/c56d5d78-7078-432d-a71e-4f9aa7b8608c/96692080673.pdf
    • https://uploads.strikinglycdn.com/files/339e5350-2ed7-421d-a207-5bcc47bbe3e5/volvo_s40_2007_service_manual.pdf
    • https://uploads.strikinglycdn.com/files/1b73aa24-99e1-4479-8427-5f506f9a15ac/86175889993.pdf
    • https://uploads.strikinglycdn.com/files/e674bc00-2947-45a9-bc54-7bda22461505/jezelu.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000067ed.bin
0a8c3f62601004eb960f08ee32a9f5d294b1356e28040c0e6d971a2f597bd1c6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x67ED 5128 bytes
font_01_sfnt_off0000796b.bin
cf6873992cf6a90d3af68b3eb9acdd9007f23a67f44deaea78a457a42b15e3a9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x796B 10600 bytes

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