Malicious PDF — malware analysis report

Static analysis result for SHA-256 0331d61b5481ad4a…

MALICIOUS

PDF

77.6 KB Created: 2020-07-28 19:56:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c71beaee4fe2db957630e96c07637bbb SHA-1: d5e716e81e8d3df74f6fd65ae49664d9f08c4e4d SHA-256: 0331d61b5481ad4a5fbb2a203dc7354aedd85cc9fae904decaedcdbcf808d397
154 Risk Score

Malware Insights

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

The PDF contains numerous links, with one specifically pointing to a known malicious redirector infrastructure. The document body, though heavily obfuscated, suggests a lure related to the 'Michelin guide 2019 logo'. The presence of a large number of external PDF links, many hosted on Shopify, indicates a link farm or a method to obscure the ultimate destination. No scripts were extracted, but the PDF structure and embedded links strongly suggest a malicious intent 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 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=michelin+guide+2019+logo
    • http://files.teachmrn.com/uploads/1/3/1/4/131407388/5142023.pdf
    • http://files.light-sup.com/uploads/1/3/2/6/132681002/lolonegesositub.pdf
    • http://files.fairlingtonfins.org/uploads/1/3/0/8/130813778/7a5f1ad.pdf
    • http://files.marvinspass.com/uploads/1/3/1/0/131069824/5139563.pdf
    • http://files.drewgrahamart.com/uploads/1/3/1/6/131637606/milepikeromomur.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/57379697448.pdf
    • https://cdn.shopify.com/s/files/1/0438/6209/8085/files/lanojagorumivanison.pdf
    • https://cdn.shopify.com/s/files/1/0433/2870/0571/files/94173546242.pdf
    • https://cdn.shopify.com/s/files/1/0433/6146/8567/files/jilezakuremufofadiburibom.pdf
    • https://cdn.shopify.com/s/files/1/0432/7967/9656/files/rinuzibirafo.pdf
    • https://cdn.shopify.com/s/files/1/0434/0819/5738/files/bijekakibudadivetibove.pdf
    • https://cdn.shopify.com/s/files/1/0437/1123/4197/files/23076492019.pdf
    • https://cdn.shopify.com/s/files/1/0431/8652/0224/files/86396822205.pdf
    • https://cdn.shopify.com/s/files/1/0439/5961/5646/files/lanufudinulifopiwune.pdf
    • https://cdn.shopify.com/s/files/1/0434/1468/3815/files/pivajerijibuwibigifipa.pdf
    • https://cdn.shopify.com/s/files/1/0433/7188/8803/files/sezososipoginevujegomozum.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b527.bin
9b366f7c6ca9cc264ff92bb9b23938e1b7d21dbc4f3b17eeda2deab79c99b628		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB527 19284 bytes
font_01_sfnt_off0000f297.bin
dd70b89c5be4f5e4e7d59d686eb12cbae2091542a8ae5d1add255be7eb4d56a0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF297 5004 bytes
font_02_sfnt_off00010392.bin
dbfa7cf9519934f42ff7b34ab9c12291e1ae40938794920c08b4d0890fd0741f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10392 11120 bytes

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