Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4a2802e1e0cd23d…

MALICIOUS

PDF

48.6 KB Created: 2020-10-12 04:17:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 9b06477c779c4af080df01ac4d9a6437 SHA-1: be3a6ae50ebd65417eb028a22dc81e6591f168e7 SHA-256: f4a2802e1e0cd23d2769b87037ef71939f8f655dc38a71db2e33c503a05b13eb
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of embedded links, with 28 external links detected, pointing to a link farm. One of these links, https://gettraff.ru/strik?keyword=naa+songs+supreme, is identified as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body contains obfuscated text and a URL that aligns with the link farm activity.

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://gettraff.ru/strik?keyword=naa+songs+supreme In PDF document text
    • http://files.mjsastro.com/uploads/1/3/1/3/131398253/7827063.pdfIn PDF document text
    • http://files.urfellowship.com/uploads/1/3/1/4/131408537/relamazuxege.pdfIn PDF document text
    • http://lozoruna.openbookseries.com/uploads/1/3/0/8/130874429/xobezovofoja.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/feb06c21-3b5f-43af-b1bb-0ae2e504c1f2/65844156904.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c5808a24-4e41-4a77-a2ba-200692c5896f/88686632417.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bf3ea395-2e4f-43bc-9cff-6dd39fca24e6/xerutasotinoviriwelam.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d99dcd59-5f05-485c-87e9-d202b8cf4d35/mozogojogijogadukaxujub.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/02e8f01b-f5eb-4eec-a391-211eb6e67de9/46353942575.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/9272/8226/files/28060764166.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/2949/8522/files/53066056591.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/8445/4811/files/tci_chapter_8_creating_the_constitution_answer_key.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/8922/3066/files/90646298909.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/88fb2253-218f-4433-bb55-0d9c2446477b/84833856116.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/988c8f96-e27d-43a0-9fce-990e763dba7b/31004383665.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_off0000839e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x839E 5076 bytes
SHA-256: 97cce9563304c8bdaab68289b8f23bb377416b6f26395d4c644a24fded25f832
font_01_sfnt_off000094d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x94D0 9664 bytes
SHA-256: 79ba21cc26e9f3323a42c6c630b4ad931d34d490c078cba08229a844be32c16e

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