Malicious PDF — malware analysis report

Static analysis result for SHA-256 0841e43f8f1d3ae9…

MALICIOUS

PDF

56.6 KB Created: 2020-08-17 12:21:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7afb1a3ce67bf7eb7cf80c81c8a507ac SHA-1: d24ba4ed1803380b2a9877048af2d077c40f1c65 SHA-256: 0841e43f8f1d3ae931787a4adea658493fecddabcf149bcd6028bd02d3c79647
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, with one identified as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains the URL https://ttraff.cc/pify?keyword=inferring+meaning+worksheet, which is likely used to direct users to malicious content. The presence of numerous external PDF links suggests a link farm or a method to distribute further malicious 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.cc/pify?keyword=inferring+meaning+worksheet
    • http://xowuvum.bradleyit.com/uploads/1/3/2/6/132681947/tigakutuset_xuduwexozeru.pdf
    • http://wosug.amgnational.org/uploads/1/3/0/7/130738850/d240bca31ee.pdf
    • http://kabeje.ancientwavestudios.com/uploads/1/3/0/7/130776257/84290.pdf
    • http://files.thetreesspeak.org/uploads/1/3/1/8/131856039/62856.pdf
    • http://tusuv.sugarcampsnowmobileclub.org/uploads/1/3/2/8/132816066/lidojomedo_jezenajipunime_jozezolexorar.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/3049/4882/files/56713375544.pdf
    • https://cdn.shopify.com/s/files/1/0432/0172/4580/files/finalaverura.pdf
    • https://cdn.shopify.com/s/files/1/0434/4889/3606/files/96269408679.pdf
    • https://cdn.shopify.com/s/files/1/0430/0426/4602/files/bolding_in_discord.pdf
    • https://cdn.shopify.com/s/files/1/0431/3183/0421/files/cultist_simulator_temptation.pdf
    • https://cdn.shopify.com/s/files/1/0430/0416/6297/files/94822684133.pdf
    • https://cdn.shopify.com/s/files/1/0431/3153/5522/files/bose_quietcomfort_30_manual.pdf
    • https://cdn.shopify.com/s/files/1/0439/4903/1592/files/mitosis_and_meiosis_review_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/xodujanizovu.pdf
    • https://cdn.shopify.com/s/files/1/0429/7929/5383/files/87715346286.pdf
    • https://cdn.shopify.com/s/files/1/0435/5473/4235/files/accountant_cv_template.pdf
    • https://cdn.shopify.com/s/files/1/0431/4444/6118/files/32152674982.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_off00009efe.bin
247d963b6f9cf8b4ac11e900d5515113b4ba3593e49870cee366f8008edd0e14		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9EFE 5240 bytes
font_01_sfnt_off0000b0bc.bin
6e7c7b742a48246a6a41ab6bdf2a5dcab98d90e1c2511991b0a1206757d61beb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB0BC 10668 bytes

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