Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1ccf35ebe9c5b0c…

MALICIOUS

PDF

42.2 KB Created: 2020-10-03 03:01:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: bdc65811170dcf2dd61cc19f18bfd157 SHA-1: 5e11a8d1e64fc1348b394a2dad25ddd0b39e8502 SHA-256: f1ccf35ebe9c5b0c60a411a819849d4dacec5e8a2b24f5d2f2bcce90a3d7ebaa
184 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to disposable hosting and are likely part of a link farm designed to redirect users to malicious sites. One prominent URL, https://cctraff.ru/strik?keyword=international+air+waybill+form+pdf, is flagged as a malicious redirector. The document body, though heavily obfuscated, contains references to 'international air waybill form pdf', suggesting a lure for users seeking such documents. The presence of numerous external links and the redirection to a known malicious domain strongly indicate a phishing or malware distribution attempt.

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=international+air+waybill+form+pdf In PDF document text
    • https://site-1037054.mozfiles.com/files/1037054/37887505505.pdfIn PDF document text
    • https://site-1037044.mozfiles.com/files/1037044/zasojises.pdfIn PDF document text
    • https://site-1037091.mozfiles.com/files/1037091/25588006542.pdfIn PDF document text
    • https://site-1037253.mozfiles.com/files/1037253/fenolirejojawenaronalal.pdfIn PDF document text
    • http://files.rafaelhohmann.com/uploads/1/3/1/8/131871704/kulopujowazaw.pdfIn PDF document text
    • http://files.heritageelementarypto.org/uploads/1/3/0/7/130776206/mameni.pdfIn PDF document text
    • http://files.duranet.ca/uploads/1/3/2/6/132681647/6a59dfec13.pdfIn PDF document text
    • http://files.charitytrainingservices.com/uploads/1/3/0/7/130775565/zijuji.pdfIn PDF document text
    • http://lizow.fmrcmembers.org/uploads/1/3/0/9/130969761/af1c15ea.pdfIn PDF document text
    • https://site-1037189.mozfiles.com/files/1037189/51388290496.pdfIn PDF document text
    • https://site-1037282.mozfiles.com/files/1037282/bomakewekobotoxape.pdfIn PDF document text
    • https://site-1036935.mozfiles.com/files/1036935/tezod.pdfIn PDF document text
    • https://site-1038958.mozfiles.com/files/1038958/23888661235.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/1/0476/7285/2646/files/langston_hughes_poem_dream_deferred_meaning.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0317/4308/files/59151688502.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/9150/8904/files/lamesosiwobozipegese.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/9113/2567/files/83770770861.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/6228/8793/files/nokolakeluvevef.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_off0000688b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x688B 5280 bytes
SHA-256: f381cebb5fe1ec2fc5a68c6496546fcd966e85320d66e6c2b9ac9e84506d2c70
font_01_sfnt_off00007a7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7A7E 9720 bytes
SHA-256: a5975d2666a1dd0435ebf8e6c8791d2c256a1a7e9fbc64c930c93d4ccc4e8167

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