Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc076bf95bb36020…

MALICIOUS

PDF

40.9 KB Created: 2020-08-25 08:56:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 09cc457a339b2b18978d26f13e5ec6b8 SHA-1: 1465bebf033e00f1e92eab94063493ed5f0a7e38 SHA-256: fc076bf95bb36020cfe2bf1187a8083d3f47d3c858ada7d3d5a754d4f7a9189a
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to Shopify domains, but one critical link directs to a known malicious redirector. The document body, though heavily obfuscated, contains the URL that triggers the malicious redirector. This suggests a phishing or scam attempt designed to lead users to malicious infrastructure.

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.com/pify?keyword=circle+equation+problems+and+answers
    • http://files.bradleystokejudo.com/uploads/1/3/0/7/130775180/6614301.pdf
    • https://cdn.shopify.com/s/files/1/0430/0426/4602/files/70919282001.pdf
    • https://cdn.shopify.com/s/files/1/0432/4366/7616/files/vte_prophylaxis_guidelines_2017_malaysia.pdf
    • https://cdn.shopify.com/s/files/1/0433/8378/3575/files/synonyms_antonyms_worksheets.pdf
    • https://cdn.shopify.com/s/files/1/0429/7526/4919/files/the_law_of_non_international_armed_conflict.pdf
    • https://cdn.shopify.com/s/files/1/0431/6702/3259/files/4013297730.pdf
    • https://cdn.shopify.com/s/files/1/0429/9217/3217/files/difference_between_android_smartphone_and_windows_phone.pdf
    • https://cdn.shopify.com/s/files/1/0433/0009/4112/files/wekezukedodajomufif.pdf
    • https://cdn.shopify.com/s/files/1/0430/6183/7981/files/lefepijapadudi.pdf
    • https://cdn.shopify.com/s/files/1/0430/0200/3609/files/sol_marksheet_2013.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_off00005a5d.bin
2353a8e0d92a9b3c87e0c87c849a444cfe524f9168aa9b9987a6bc1632f82a52		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5A5D 5484 bytes
font_01_sfnt_off00006cde.bin
51749b2198da09c8bd523205a1904587368fbbc4178294ea4bf8c0347f233f71		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6CDE 12856 bytes

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