Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad38381667e40273…

MALICIOUS

PDF

48.9 KB Created: 2020-08-28 05:22:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 31ecddaa1ac83d26775c63d9579c81c3 SHA-1: e9c9a79625a5c6afe6732d609c1cc1b53c7e54fd SHA-256: ad38381667e40273e47edcf7ab50de573ffc50be0602c0614d5e4fd2d0e33708
162 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, which is further supported by a PDF link farm heuristic. The document body, though heavily obfuscated, contains a URL that points to a malicious redirector. The presence of numerous external PDF links suggests an attempt to manipulate search engine results or distribute malicious content.

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://ttraff.link/pify?keyword=american+tourister+3+dial+combo+lock In PDF document text
    • http://nomusor.carlislekidshouse.org/uploads/1/3/1/4/131437657/memejolenuvajaguz.pdfIn PDF document text
    • http://files.motorshoweast.com/uploads/1/3/1/4/131437733/3699278.pdfIn PDF document text
    • http://nejotofu.marlasmathpages.com/uploads/1/3/1/4/131438428/2e241d5.pdfIn PDF document text
    • http://files.bobadneystudio.com/uploads/1/3/0/7/130776499/2448495.pdfIn PDF document text
    • http://sanuwa.joannaruhl.com/uploads/1/3/1/3/131378776/sokugoxipamivix-jinad-gapenorovu-buzoxe.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/1/0433/8001/5262/files/16836330891.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0463/3391/9393/files/58126015477.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/6643/3435/files/sosivuginidepikivedate.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0461/4543/7859/files/dakigimuzizo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/3301/0082/files/21379459866.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/7922/1927/files/78424548932.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/5774/0967/files/kurilasegiwozafavotuk.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0446/6864/9625/files/lightning_arrester_types.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/8794/6133/files/tekubopodubixaf.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/3398/4157/files/lethality_jhin_guide.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/1144/0803/files/canarios_sheet_music_for_guitar.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/6033/6542/files/free_editable_weekly_calendar_template.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/6371/3690/files/63873910053.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/2123/6384/files/dexivoribenojoteviletu.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_off00008064.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8064 5444 bytes
SHA-256: 5124cc7bfcc2cdbd791125f8c28d266d5a30339a08a9787e73341a3b0f89d62f
font_01_sfnt_off000092bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x92BC 10248 bytes
SHA-256: dc5d5a233254de35337aec0fefcdb1680a2a7bc440ef62215044940940cbff0c

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