Malicious PDF — malware analysis report

Static analysis result for SHA-256 12e44f9f6776d671…

MALICIOUS

PDF

48.3 KB Created: 2020-10-12 00:48:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 88635fbcfa6513012786bb304e789fa6 SHA-1: 71291b00793a37321e822f760a2c2ac27cb039cc SHA-256: 12e44f9f6776d671ea56c48a2700a8e11f9adb1692123e29e80bd451ef398df5
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded URLs pointing to various external PDF files, indicating a link farm or SEO manipulation tactic. One critical heuristic identified a link to known malicious redirector infrastructure, suggesting a potential distribution point for further malicious content. The ML classifier also strongly flagged this PDF as malicious.

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=introdu%25C3%25A7%25C3%25A3o+a+administra%25C3%25A7%25C3%25A3o+maximiano+pdf In PDF document text
    • http://kusitot.gsportz.com/uploads/1/3/0/7/130776279/jinelos_natafodizusopu.pdfIn PDF document text
    • http://files.paschalorchestra.com/uploads/1/3/0/7/130738748/piwuverinegirudofowu.pdfIn PDF document text
    • http://files.lahabrahighschoolchoir.com/uploads/1/3/1/4/131437978/fizevemevol.pdfIn PDF document text
    • http://sovom.buildingbetterbonds.com/uploads/1/3/1/3/131379205/3093469.pdfIn PDF document text
    • http://files.saudipakcafe.com/uploads/1/3/1/6/131637257/af90f5.pdfIn PDF document text
    • http://files.modernsageevents.com/uploads/1/3/1/4/131452824/e50cf266295.pdfIn PDF document text
    • http://files.pastorjadeyi.net/uploads/1/3/1/3/131380308/sewejukaziv_zonab_dudeketalomegu.pdfIn PDF document text
    • http://files.mahajosh.com/uploads/1/3/1/4/131406356/5754309.pdfIn PDF document text
    • http://jugemasaz.albertvilleband.com/uploads/1/3/2/7/132740515/888305.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/1/0435/8720/7327/files/victorias_secret_pink_wireless_bra.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/0308/4451/files/florida_standards_ela_1st_grade.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/4352/8609/files/kudunonituz.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/8792/0294/files/blue_exorcist_fanfiction_rin_drinks_holy_water.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0495/9961/1047/files/unit_4_worksheet_1_intro_to_correlation.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_off00007765.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7765 5660 bytes
SHA-256: e15da3725457a22988d249291c6cf59500ef4ca24667c415efffb73045c8462d
font_01_sfnt_off000089fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x89FB 13544 bytes
SHA-256: 1ecd78233eeda53fd30d729eee82d05b034425e33442a113a8641648733ec57d

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