Malicious PDF — malware analysis report

Static analysis result for SHA-256 764e774f52a4d56b…

MALICIOUS

PDF

42.1 KB Created: 2020-10-21 12:06:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: ff9a0c6c456b44d3054aae834b7fde28 SHA-1: 970930327c1de1263a37877275117b052a778d3f SHA-256: 764e774f52a4d56b786d03089aa9ca150759d1e218763a0ad51db224758f42cf
182 Risk Score

Malware Insights

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

The PDF contains a lure for a software serial number, which is a common tactic for distributing malware or conducting phishing. It includes a link to a known malicious redirector and a large number of other PDF links, suggesting a link farm designed to obscure the final destination. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/wb?keyword=dragon%20naturallyspeaking%2013%20serial%20n In PDF document text
    • https://cdn-cms.f-static.net/uploads/4377095/normal_5f8af605169d6.pdfIn PDF document text
    • https://kafaziwe.weebly.com/uploads/1/3/1/0/131070109/88400692d7.pdfIn PDF document text
    • https://xijonezamo.weebly.com/uploads/1/3/1/4/131407630/rivoguguve_menidepojak.pdfIn PDF document text
    • https://zuxuzesis.weebly.com/uploads/1/3/1/4/131438019/8640575.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381101/normal_5f8c7ff8f2308.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374699/normal_5f8bd67844562.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388416/normal_5f8d45f22a551.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/8db82ef3-18e9-4559-a031-06185edc29c2/printable_multiplication_tables_from.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d25042b3-74fc-41b8-b720-1f8f8a344296/the_absolutely_true_diary_of_a_part-.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/649fdacd-6a39-4037-a2bc-82cb1b302990/favinilowawe.pdfIn PDF document text
    • https://s3.amazonaws.com/mijedusovineti/9632625501.pdfIn PDF document text
    • https://s3.amazonaws.com/mijedusovineti/xitodosokedugowufidogivan.pdfIn PDF document text
    • https://s3.amazonaws.com/susopuzupure/31890884428.pdfIn PDF document text
    • https://s3.amazonaws.com/gupuso/pajerebowifi.pdfIn PDF document text
    • https://s3.amazonaws.com/tadovu/high_school_reading_comprehension_passages.pdfIn PDF document text
    • https://s3.amazonaws.com/pazifetanegapu/customs_law_manual_2017.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006473.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6473 5368 bytes
SHA-256: 33104db3bffbf95f4b4a5aee6fb9a99a4a27c20998451bf5c7c81ad0756711ef
font_01_sfnt_off000076dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x76DC 10656 bytes
SHA-256: d1f64556937dd03b8244166a9a4421133b5eb18af999984d1baafeeadc61a535

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