Malicious PDF — malware analysis report

Static analysis result for SHA-256 b012163913c14845…

MALICIOUS

PDF

59.1 KB Created: 2020-10-05 08:50:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 325762e5d73e2196d0747b9142863a0d SHA-1: d55e2615a70026a5771797a1f3ac63206dc34826 SHA-256: b012163913c14845591b29f06f2b1b453ba420944645fd5da30cd373d1926942
184 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to disposable hosting or known malicious redirectors. The primary malicious URL identified is 'https://cctraff.ru/strik?keyword=22+hebrew+letters+meaning+pdf', which is flagged as a malicious redirector. This suggests the document is designed to lure users into clicking links that lead to malicious content or further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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=22+hebrew+letters+meaning+pdf In PDF document text
    • https://site-1040888.mozfiles.com/files/1040888/fufazuberokevinarininakad.pdfIn PDF document text
    • https://site-1039689.mozfiles.com/files/1039689/64818798789.pdfIn PDF document text
    • https://site-1037253.mozfiles.com/files/1037253/safikajono.pdfIn PDF document text
    • https://site-1042205.mozfiles.com/files/1042205/zipaduroxu.pdfIn PDF document text
    • http://nedinof.milenaszymanek.com/uploads/1/3/1/8/131856584/7119517.pdfIn PDF document text
    • http://wawod.studio-macs.com/uploads/1/3/2/6/132695569/cc4d4d8e1edda.pdfIn PDF document text
    • http://files.aumaesthetics.com/uploads/1/3/0/7/130776655/b6168517aaac92.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/245b6994-5aa3-41b7-84e0-46c2d4fdf448/68154821787.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/456d478f-3d6a-4a52-be1b-73483979b3f3/50569299006.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6f1a4cfd-2c89-4dae-9e2c-c5f4b50d350a/76091574026.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/08d56d00-34d1-4a34-8c21-7e801f08c825/lagaziva.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2cfbc5e9-5a6c-4b6c-b6fb-161310b3037a/27226861068.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/2440/8991/files/76089435234.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/8297/3346/files/92599912457.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/9041/4241/files/4x6_photo_printer_for_iphone.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/2611/9831/files/george_washington_whiskey.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_off0000a251.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA251 5724 bytes
SHA-256: 757c6ad01f4347daa4b4fc756d0a66eca40290b745b89da3f49db219a1c2e23e
font_01_sfnt_off0000b5a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5A9 12216 bytes
SHA-256: 28dc1e177dee6a7d1141247550709b94475a2063a67b504c80a2a4fc7dd3562f

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