Malicious PDF — malware analysis report

Static analysis result for SHA-256 c87c8bd4062f36c6…

MALICIOUS

PDF

39.8 KB Created: 2020-10-01 08:00:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-01-15
MD5: bf31812b510607b1edd0b618800ff8eb SHA-1: f8e63132788b913ff79b9a85a15c741928cf20b4 SHA-256: c87c8bd4062f36c6de58a859941b724f7ba49ab28e499cc5ed381650afe9b2a2
184 Risk Score

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://gettraff.ru/strik?keyword=uses+of+past+perfect+continuous+tense+pdf In PDF document text
    • http://files.himalclinic.com/uploads/1/3/1/8/131856956/6304086.pdfIn PDF document text
    • http://files.staffordmemorialpark.com/uploads/1/3/2/7/132740954/zovolagozel.pdfIn PDF document text
    • http://files.shadyblueamstaffs.com/uploads/1/3/0/9/130969873/pupexo_serif.pdfIn PDF document text
    • http://gevotisir.lindsayblooms.com/uploads/1/3/1/3/131384169/2749834.pdfIn PDF document text
    • https://site-1037175.mozfiles.com/files/1037175/fofitidalitelekibase.pdfIn PDF document text
    • https://site-1039147.mozfiles.com/files/1039147/moxiwimerod.pdfIn PDF document text
    • https://site-1037073.mozfiles.com/files/1037073/kawokujudakutikamo.pdfIn PDF document text
    • https://site-1037828.mozfiles.com/files/1037828/59693013146.pdfIn PDF document text
    • http://zaluj.sthlmtapas.se/uploads/1/3/1/4/131437119/1b771dda04ac7f.pdfIn PDF document text
    • http://nepese.resourceology360.com/uploads/1/3/0/7/130739629/4f94d2.pdfIn PDF document text
    • http://files.yourenglishsuccesstoday.com/uploads/1/3/0/8/130874658/kejaduxevafebinovit.pdfIn PDF document text
    • http://files.solutionfm.com/uploads/1/3/2/3/132302951/xigegegadafosi.pdfIn PDF document text
    • http://pasuripe.ctcornerstone.com/uploads/1/3/1/3/131380433/bf433a011e28.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/195b0394-05ed-4a73-8736-837458e693b1/26092119968.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f9109a1b-86f4-4558-bd03-c24c87f784b4/50762944955.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_off00005f04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5F04 5108 bytes
SHA-256: 0e7b5587998934c40d96e34c6477159a71807b8061400cc01b5d23424725b0da
font_01_sfnt_off00007076.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7076 9936 bytes
SHA-256: 0ea50ca7d496cddb2f1df63754fcb665cd4c9e66b6eb4a8ed7c8d3bd38c49c19

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