Malicious PDF — malware analysis report

Static analysis result for SHA-256 8609811fb5a453b7…

MALICIOUS

PDF

47.1 KB Created: 2020-10-02 22:41:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: ad7a1fb4bb8e0f58a267666cb59fb3a2 SHA-1: 5cbf0a4209ecb378b8bf485cf1ace2ee58020e91 SHA-256: 8609811fb5a453b7fa8ac7b9016be3828f255db90f7726b12c38e8fb1b7134e2
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to potentially malicious redirectors or link farms. The document body, though partially corrupted, contains a URL that matches the heuristic firing for a malicious redirector. This suggests the document's primary purpose is to redirect users to malicious sites, likely for further exploitation or phishing.

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://ggtraff.ru/strik?keyword=tactics+ogre+let+us+cling+together+walkthrough In PDF document text
    • https://site-1037081.mozfiles.com/files/1037081/jezijatewonanuposa.pdfIn PDF document text
    • https://site-1036872.mozfiles.com/files/1036872/nuvuwozumenojila.pdfIn PDF document text
    • https://site-1037029.mozfiles.com/files/1037029/zebuv.pdfIn PDF document text
    • http://files.mapost75.com/uploads/1/3/1/8/131856372/2545246.pdfIn PDF document text
    • http://jesugotat.offthemapmaryvillealcoa.org/uploads/1/3/1/3/131380284/67fa7ec0824351.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/1/0480/5437/0468/files/wolan.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/1034/2563/files/pass_compos_exercices_avoir.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0461/3655/7736/files/78274321647.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2583bd00-87fc-463a-a661-24282e318dec/kazoguveg.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9a90e7fd-0c47-4d76-89db-194a8eea2631/faminamixutev.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000066d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x66D1 5160 bytes
SHA-256: a7dd82c4984382e9ef95c681e601c1f5e496965beafc97f19f50a25371c87619
font_01_sfnt_off0000789f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x789F 5164 bytes
SHA-256: aa454221dfcadc4c8e2d4d09a79c96629d2f6270d8fee40e4ac1dd710cc4651c
font_02_sfnt_off00008a3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8A3D 11012 bytes
SHA-256: 73354b69cc655d1cc0de366f80a7eccc1ebc50b2265018b30a4029051957cc28

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