Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b5a711ff2527fc2…

MALICIOUS

PDF

63.2 KB Created: 2020-07-30 09:20:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 348977594c87023df13c6a2ceee2df2c SHA-1: e6e646fd3abd335765d3169b1527924b742defbd SHA-256: 6b5a711ff2527fc2e45b9780902bef3758783430800f90a359da92fd84676e21
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one identified as a malicious redirector. The ML classifier also flagged the document as malicious. The presence of a large number of external PDF links suggests a link farm or SEO manipulation tactic, potentially leading to malicious content 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://ttraff.ru/pify?keyword=accoast+trial+pdf
    • http://files.richardjespers.com/uploads/1/3/1/1/131163632/4699160.pdf
    • http://files.chimpsevents.com/uploads/1/3/1/4/131437318/3336238.pdf
    • http://files.borderdentalstudygroup.org/uploads/1/3/0/8/130874627/6948eaa.pdf
    • http://files.doggiedaycareconsulting.com/uploads/1/3/1/3/131384175/nolidevowa_dufuponalasini_bomudoto_togof.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/1224/4134/files/musotevaraxibetulidonino.pdf
    • https://cdn.shopify.com/s/files/1/0439/3215/6059/files/vazerotusajopasakixife.pdf
    • https://cdn.shopify.com/s/files/1/0440/5110/3894/files/13929164475.pdf
    • https://cdn.shopify.com/s/files/1/0435/6741/5457/files/84916199141.pdf
    • https://cdn.shopify.com/s/files/1/0436/1371/6643/files/76573893266.pdf
    • https://cdn.shopify.com/s/files/1/0434/0734/3779/files/97953350924.pdf
    • https://cdn.shopify.com/s/files/1/0433/6310/6968/files/jotofijenixokap.pdf
    • https://cdn.shopify.com/s/files/1/0432/8184/2341/files/96310682030.pdf
    • https://cdn.shopify.com/s/files/1/0429/3004/5091/files/32953288147.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/nuruge.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/moxudenolaruxorurafugi.pdf
    • https://cdn.shopify.com/s/files/1/0437/4121/6917/files/53144628822.pdf
    • https://cdn.shopify.com/s/files/1/0437/0500/8282/files/pegewipujivirimolijolixif.pdf
    • https://cdn.shopify.com/s/files/1/0433/2489/9496/files/75520169427.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bd8a.bin
224b58218c09f5be1a12956d28bc9e800805be72f7e24afd1824e1b72d3b6e26		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBD8A 4704 bytes
font_01_sfnt_off0000cd87.bin
cb310733778860382a29006cd6aab88b74ec5e5dc4a8a3518d13ee4388803fb3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCD87 9896 bytes

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