Malicious PDF — malware analysis report

Static analysis result for SHA-256 efdefe6d455c5344…

MALICIOUS

PDF

52.2 KB Created: 2020-08-26 20:08:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 264d803c94a7c0d6d2e3055a71422a60 SHA-1: 5387b69572f637757ed7e2b40053f4053e119bf0 SHA-256: efdefe6d455c53449be72dab762e39e1c3830edd963d3670eba6808dd1dd1cdc
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a critical heuristic firing for a malicious redirector link, which is also present in the document body. This link, 'https://ttraff.me/pify?keyword=how+to+ace+the+amazon+leadership+pri', is designed to lure users with a seemingly relevant topic. The document also exhibits characteristics of a link farm, with numerous embedded URLs pointing to external PDF files, many hosted on Shopify. The ML classifier strongly flagged this PDF as malicious. No scripts were extracted, limiting the analysis of direct payload execution.

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.me/pify?keyword=how+to+ace+the+amazon+leadership+pri
    • http://ropepu.gmsmusic.org/uploads/1/3/2/7/132710703/pawubakafivoz.pdf
    • http://files.awananet.org/uploads/1/3/1/4/131453278/radorolerateb-volukon.pdf
    • http://kiparonu.estherleecounselor.com/uploads/1/3/0/8/130814328/3376848.pdf
    • https://cdn.shopify.com/s/files/1/0436/1990/9794/files/baroque_architecture.pdf
    • https://cdn.shopify.com/s/files/1/0435/7269/1099/files/bovumo.pdf
    • https://cdn.shopify.com/s/files/1/0434/7727/0678/files/93495394015.pdf
    • https://cdn.shopify.com/s/files/1/0433/3387/7915/files/applied_psychology_in_human_resource_management_download.pdf
    • https://cdn.shopify.com/s/files/1/0431/9261/5073/files/46491818952.pdf
    • https://cdn.shopify.com/s/files/1/0433/4233/2057/files/bharathiyar_songs_with_meanings_in_tamil.pdf
    • https://cdn.shopify.com/s/files/1/0430/2677/6227/files/verakiluwuwunovuzexoj.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/97242885008.pdf
    • https://cdn.shopify.com/s/files/1/0441/1876/9816/files/counter_strike_source_mods_free.pdf
    • https://cdn.shopify.com/s/files/1/0432/9917/6612/files/gezojadokojeniwege.pdf
    • https://cdn.shopify.com/s/files/1/0435/4244/6229/files/luwepogagogazunibexov.pdf
    • https://cdn.shopify.com/s/files/1/0428/8200/7199/files/strategic_thinking_training.pdf
    • https://cdn.shopify.com/s/files/1/0432/8259/6004/files/xakiroxivibekopozefelame.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_off00008c7b.bin
7e4e33a2b7ffcfecc8894ea1c4104da047c5a15168b0b704518b548c34b78a38		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8C7B 5416 bytes
font_01_sfnt_off00009ecf.bin
44aef5a4f25582fbd85054e8608d19cac488024e892276b15e19345e008e0fb6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9ECF 10820 bytes

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