Malicious PDF — malware analysis report

Static analysis result for SHA-256 3580c6f8ced0dfe8…

MALICIOUS

PDF

46.0 KB Created: 2020-11-02 18:57:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 192bc507b0218812a51e60b52cf73d2d SHA-1: 30327444f237f284e06020215d17c81fe66dc563 SHA-256: 3580c6f8ced0dfe886d1186c5a871dfade1e0fdc24ef6567375414a30a2ef7db
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document is designed to appear as a worksheet with answers, but it contains a large number of embedded links to external PDFs, forming a link farm. One of these links directs to a known malicious redirector, indicating an attempt to lead users to harmful content. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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.
  • 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://cctraff.ru/strik?keyword=mole+conversions+practice+worksheet+answers In PDF document text
    • https://cdn-cms.f-static.net/uploads/4370270/normal_5f8943941eab4.pdfIn PDF document text
    • https://tojogemul.weebly.com/uploads/1/3/4/3/134360812/d71c9d84.pdfIn PDF document text
    • https://rusepokobedog.weebly.com/uploads/1/3/4/3/134366979/adf6bb2e06f.pdfIn PDF document text
    • https://ruwopevod.weebly.com/uploads/1/3/1/3/131397973/nafegemezaf.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/7daefe51-7333-4d4c-ba53-28dc47f50320/rixozoxivemotujotamenew.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3fb36efb-c823-470a-addd-88aae7b166e0/joberigawamomunokevasugak.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/2990/4032/files/dagurivakawadawobuvugaz.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/6128/0413/files/kilitusadi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c997b0cc-2b4b-45c5-8797-8899dec58bec/second_partial_derivative_test.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/6128/0413/files/komabek.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/7565/6097/files/46599115610.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/7551/3749/files/kidemugigofo.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_off000071dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x71DD 5244 bytes
SHA-256: 835ace4d3e0492f65d36d227b521fa83edfba954b4e1ccc041cd674b2787b46d
font_01_sfnt_off000083cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x83CB 11680 bytes
SHA-256: 60372bbe3b9e49a30393a32d9a9d8c382b5edd321e853cf1a86cb5700248b6f4

Open this report in the interactive analyzer, or submit your own file for analysis.