Malicious PDF — malware analysis report

Static analysis result for SHA-256 999e19be4335167d…

MALICIOUS

PDF

56.6 KB Created: 2020-08-04 01:01:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fac896c403d95a147f98b658bcce1167 SHA-1: c15197c904a20b116738ef26b5415094ebe0df52 SHA-256: 999e19be4335167d390b7473225fef98dc234b30f8f5e37e856f9bacabb54971
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Phishing: Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded links, with a critical heuristic firing indicating a link to known malicious redirector infrastructure at `https://ttraff.ru/pify?keyword=bourbon+reforms+pdf`. The document body, though heavily obfuscated, contains text suggesting a lure related to 'Bourbon reforms pdf'. The presence of a large number of external PDF links, many hosted on Shopify, suggests a link farm designed to distribute malicious content or manipulate search engine results. No scripts were extracted from this sample.

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=bourbon+reforms+pdf
    • http://files.classof68organization.com/uploads/1/3/2/6/132681495/kamerenukazokobegul.pdf
    • http://gomum.congoeducationpartners.org/uploads/1/3/0/8/130873851/gusaxu.pdf
    • http://files.meralomabikeclub.ca/uploads/1/3/2/7/132710491/7211618.pdf
    • https://cdn.shopify.com/s/files/1/0431/4474/1024/files/finekelimeliw.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/51982080438.pdf
    • https://cdn.shopify.com/s/files/1/0433/2358/8773/files/likotumefuxukasexamaxaxo.pdf
    • https://cdn.shopify.com/s/files/1/0435/3461/4688/files/karupilumodinitoz.pdf
    • https://cdn.shopify.com/s/files/1/0438/3378/6530/files/23471996799.pdf
    • https://cdn.shopify.com/s/files/1/0437/6710/3645/files/dumulazofuxok.pdf
    • https://cdn.shopify.com/s/files/1/0430/1763/3949/files/99871866259.pdf
    • https://cdn.shopify.com/s/files/1/0429/9263/1962/files/35744657565.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/tanedikefiresemur.pdf
    • https://cdn.shopify.com/s/files/1/0445/3584/0932/files/identification_of_functional_groups_in_organic_compounds_practical.pdf
    • https://cdn.shopify.com/s/files/1/0435/6849/6798/files/81410120993.pdf
    • https://cdn.shopify.com/s/files/1/0432/2027/1259/files/lg_appliance_rebates_2016.pdf
    • https://cdn.shopify.com/s/files/1/0434/4394/5622/files/14992568658.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/bifezunelavezide.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00009a58.bin
820ff003d24e7b6c24932a228bf600650fde947712bde22601087bf43d61843a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9A58 5132 bytes
font_01_sfnt_off0000abb6.bin
2538d2c5686435ea477bd8ff4dbbb4b3c135507479b008c245ced80aedaa7e48		 pdf-font-stream PDF embedded font (sfnt) at offset 0xABB6 13160 bytes

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