Malicious PDF — malware analysis report

Static analysis result for SHA-256 c23e85c6a51a3bbd…

MALICIOUS

PDF

124.6 KB Created: 2020-08-10 18:56:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1bd6d07391e8bbebb8977da3d65fc145 SHA-1: 9b123a90e9301e0aa5eb7aa99cb536844fc15d03 SHA-256: c23e85c6a51a3bbd8f2cee7c7e9f713140f2bb9d79378829f2c92be6cf6e7d1b
152 Risk Score

Malware Insights

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

The PDF contains a link that redirects to a malicious URL, disguised as a document about quantitative aptitude. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK confirms this behavior. The ML classifier also strongly indicates maliciousness. The document body contains the malicious URL, suggesting a social engineering lure to trick users into clicking it.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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=tricks+to+solve+quantitative+aptitude+pdf
    • http://dejun.aslileblebicioglu.com/uploads/1/3/2/6/132695829/wogox.pdf
    • http://files.fpgreaterclayton.com/uploads/1/3/1/4/131453329/3724431.pdf
    • http://files.centralcoastna.org/uploads/1/3/1/3/131379054/f104b.pdf
    • http://wadakim.unclerhetts.com/uploads/1/3/1/3/131381204/4faf0.pdf
    • http://files.bonvivantgourmets.com/uploads/1/3/0/7/130774972/bee67.pdf
    • https://cdn.shopify.com/s/files/1/0432/5530/0249/files/mukajim.pdf
    • https://cdn.shopify.com/s/files/1/0429/3669/6995/files/99672240446.pdf
    • https://cdn.shopify.com/s/files/1/0440/3865/2054/files/spreadsheet_program.pdf
    • https://cdn.shopify.com/s/files/1/0431/9599/0175/files/sebozidolizibomabe.pdf
    • https://cdn.shopify.com/s/files/1/0438/5295/5810/files/dv_lottery_application_form.pdf
    • https://cdn.shopify.com/s/files/1/0430/7448/6421/files/tulunasosimalimovijozenul.pdf
    • https://cdn.shopify.com/s/files/1/0431/4827/9957/files/87541530927.pdf
    • https://cdn.shopify.com/s/files/1/0450/7166/3256/files/aquatic_life_preservation.pdf
    • https://cdn.shopify.com/s/files/1/0429/8702/8641/files/wuxedapiwarejaliko.pdf
    • https://cdn.shopify.com/s/files/1/0431/7387/1767/files/29654855380.pdf
    • https://cdn.shopify.com/s/files/1/0433/6038/7227/files/liputemiganutewopebi.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00017efb.bin
a8640cb23b15ac802f89dd0648c07b7ad030d8b62c5f78624c3814794ace58c4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x17EFB 1684 bytes
font_01_sfnt_off0001875f.bin
6ee6c9aad81fb1594aa5e37ece5f152fa0fd39b19c353298446ae65be293a5e7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1875F 5348 bytes
font_02_sfnt_off000199a5.bin
8a3a762942a8c304d5e63827f8da13157175c08ee47d7b429bf3f5b5bf3b7827		 pdf-font-stream PDF embedded font (sfnt) at offset 0x199A5 16528 bytes
font_03_sfnt_off0001cd1d.bin
8b43df3ed75bf6d9fca93646995bd062e19f7583525952fd6d661b964dd6b30a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1CD1D 16560 bytes

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