Malicious PDF — malware analysis report

Static analysis result for SHA-256 2544fc136af7de6c…

MALICIOUS

PDF

46.7 KB Created: 2020-09-30 16:14:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 5f34b2c097397cf89104f5a89a342d4f SHA-1: 7261dcda115672dbea97363ccb261f2ad7e66266 SHA-256: 2544fc136af7de6c9cd3bca19222160a0dfdb6f9528b07501df1cdadc2e298f8
124 Risk Score

Malware Insights

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

The PDF contains embedded links that point to known malicious redirector infrastructure, specifically `https://cctraff.ru/strik?keyword=partnership+agreement+contract+template+pdf`. The document body, though heavily obfuscated, also contains this URL and other links to disposable hosting, suggesting a lure to a malicious site. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is designed to redirect users to harmful content.

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 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=partnership+agreement+contract+template+pdf In PDF document text
    • https://site-1036872.mozfiles.com/files/1036872/16009741329.pdfIn PDF document text
    • https://site-1036785.mozfiles.com/files/1036785/fudovajuna.pdfIn PDF document text
    • https://site-1036725.mozfiles.com/files/1036725/ligalopepipududij.pdfIn PDF document text
    • https://site-1036957.mozfiles.com/files/1036957/xewitudogujeve.pdfIn PDF document text
    • https://site-1036991.mozfiles.com/files/1036991/59966811281.pdfIn PDF document text
    • https://site-1036874.mozfiles.com/files/1036874/22815381111.pdfIn PDF document text
    • https://site-1038511.mozfiles.com/files/1038511/pofimaregibenaxelujegisav.pdfIn PDF document text
    • https://site-1037219.mozfiles.com/files/1037219/52107921669.pdfIn PDF document text
    • https://site-1036869.mozfiles.com/files/1036869/16210071699.pdfIn PDF document text
    • http://files.angeliquemichaudphotographie.com/uploads/1/3/1/4/131437530/465aecb3230f9cf.pdfIn PDF document text
    • http://files.annryalsart.com/uploads/1/3/2/8/132815755/turovejoz_dapedumufifif.pdfIn PDF document text
    • http://kosizokas.jessalynlevesque.com/uploads/1/3/1/8/131856333/niresuderosaz_wibitodo_moxibagewexol.pdfIn PDF document text
    • http://files.delivertrust.com/uploads/1/3/0/7/130740112/02396256c.pdfIn PDF document text
    • http://files.thecostaricakid.com/uploads/1/3/0/8/130873708/vasokivexi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://cdn.shopify.com/s/files/1/0429/2126/3271/files/48673366592.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/3260/7894/files/tezaz.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/0096/2967/files/34095090777.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_off00006b1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6B1C 5356 bytes
SHA-256: 75adca3e462b9d2de74232035bc5954d2b1a492d03be14555ba19105ffcc78fb
font_01_sfnt_off00007d17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7D17 9932 bytes
SHA-256: a09aa88d2b40f66410db084f6d9e8a86bbfa0aeffd0fa04ac6d3824d208399ab
font_02_sfnt_off00009ee6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9EE6 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

Open this report in the interactive analyzer, or submit your own file for analysis.