Malicious PDF — malware analysis report

Static analysis result for SHA-256 31d74d24afbb340c…

MALICIOUS

PDF

44.4 KB Created: 2020-10-01 00:08:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: b96145faef5a957aeac64032d36b86ba SHA-1: bf2523129ace88e44b18911975dc5637c0efd0e7 SHA-256: 31d74d24afbb340c899a1a6d4384264eb30a0d5b659a362345ecc8053a4dceee
154 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link disguised as a comic book title, aiming to trick users into clicking it. The ML classifier strongly flagged this PDF as malicious, and it exhibits characteristics of a link farm. While no scripts were directly extracted, the presence of embedded URLs and the overall structure suggest an attempt to redirect users to malicious infrastructure.

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=read+batman+the+killing+joke+pdf In PDF document text
    • http://files.casinodealerswebsite.com/uploads/1/3/1/4/131437513/merij.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/2794/6904/files/jurnal_ageratum_conyzoides.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/7844/9307/files/whirlpool_supercapacity_465_manual.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/0978/4482/files/reruxowejulukoribibawasub.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/6885/8276/files/77009831689.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/4835/3442/files/wexobezalofu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7098edf0-f88f-43ad-97c4-c265fbbec595/56474105662.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ef83437a-1a39-453e-98cd-9f4c470ad644/43383662366.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/8189/1989/files/dodawajomuwebokenerev.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/2692/2147/files/tupiboke.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/0649/8728/files/pabatanadalolaxar.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_off00006ef5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6EF5 5468 bytes
SHA-256: 48dcbd11de47f2f59a629f4e2a6b1648e168b5c0d0f7469fd30bc40a481cd987
font_01_sfnt_off00008177.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8177 10488 bytes
SHA-256: f899ea1eeaeecccade2a85948726695bc559ebf5565b1ecad2861179ac665f9b

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