Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9c4dbbb911c5e33…

MALICIOUS

PDF

60.4 KB Created: 2020-10-11 09:42:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 8607c81039b0b91048a1495afc6d133d SHA-1: 95a9aa71ac25e81b1276fe6bd9f00e0089d61b1a SHA-256: c9c4dbbb911c5e3395093577e683a6710ffb81e9cebad02929c34db9be369356
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with several pointing to known malicious redirector infrastructure and others forming a link farm. The ML classifier strongly indicated maliciousness. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect users to malicious sites, potentially for phishing or malware distribution.

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 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.
  • 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=swami+ramdas+pdf In PDF document text
    • http://gekisa.croghanfiredept.net/uploads/1/3/1/4/131406082/gigefupokumap.pdfIn PDF document text
    • http://files.smartlinktechs.com/uploads/1/3/2/7/132740352/palovawipipo-gaxixab-zevutes-senafoxebasavo.pdfIn PDF document text
    • http://files.rootptandwellness.org/uploads/1/3/1/3/131383426/de4a6.pdfIn PDF document text
    • http://files.texomafurniture.com/uploads/1/3/0/7/130740609/5cbfc.pdfIn PDF document text
    • http://files.ashleystevensonmemorialscholarship.com/uploads/1/3/1/3/131398025/pigemopagoronode.pdfIn PDF document text
    • https://site-1038901.mozfiles.com/files/1038901/pubabonaxuravomobosubobis.pdfIn PDF document text
    • https://site-1048190.mozfiles.com/files/1048190/kumiwagufoniwif.pdfIn PDF document text
    • http://jukako.indrapsofian.com/uploads/1/3/1/4/131406717/1763406.pdfIn PDF document text
    • http://files.claresartwork.com/uploads/1/3/1/4/131483584/sezerunukesa-dupubutijakipa-pidokuwijo.pdfIn PDF document text
    • http://files.faithgp.com/uploads/1/3/1/8/131857383/sudagitevesuf-zajipifetebi-tapafagewin-xijuduzavopiges.pdfIn PDF document text
    • http://files.playittodaygames.com/uploads/1/3/2/8/132816117/2928816.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/1/0268/7247/9930/files/69507812752.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/4605/1744/files/72978800779.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/3250/1656/files/94501064981.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/9258/5885/files/fudegapirurezo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/6660/4182/files/mtg_goblin_guide_strategy.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_off0000a440.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA440 4724 bytes
SHA-256: 7b91551670f88dad2d486b9fcb0554d8c52a25f8da585c5fc49f1dc3606aa4db
font_01_sfnt_off0000b446.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB446 10108 bytes
SHA-256: 3dc1d3366d2f9d225971e329dace5abc6aca4d50af4ee7645525680ed08b4b39
font_02_sfnt_off0000d6dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6DC 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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