Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4720d3980717003…

MALICIOUS

PDF

32.1 KB Created: 2020-09-02 02:07:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 235092fd93fd63b45d73cace4ac9bfe9 SHA-1: 4613c3b320ba440de711c9efafc0abfc1de83e5f SHA-256: a4720d39807170039375bdd905959d061cdcebb907cb6846de205e87f4fc20d8
154 Risk Score

Malware Insights

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

The PDF file contains a link to a known malicious redirector, ttraff.com, which is disguised as 'Vowels worksheets for class 1'. This heuristic, combined with the ML classifier flagging the PDF as malicious, strongly suggests a phishing or social engineering attack. The document body and embedded URLs confirm the lure, directing the user to the malicious redirector.

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=vowels+worksheets+for+class+1
    • https://static.usrfiles.com/ugd/3ce946_22b3852b61a64271aeb187e7817f50c7.pdf
    • https://static.usrfiles.com/ugd/02af14_9c24b1489beb4ab0926f8357c2648af5.pdf
    • https://static.usrfiles.com/ugd/b8c837_8eafda8cdabe4d9e95f107198542fcfc.pdf
    • https://cdn.shopify.com/s/files/1/0431/9156/6493/files/cell_cycle_control_mechanism.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/38746106010.pdf
    • https://cdn.shopify.com/s/files/1/0433/1683/8558/files/dasekonawoj.pdf
    • https://cdn.shopify.com/s/files/1/0435/6017/3717/files/geocentric_model_of_the_solar_system.pdf
    • https://static.usrfiles.com/ugd/2f3216_be0bfb4163cb41378338b96e7f6e99ea.pdf
    • https://static.usrfiles.com/ugd/b8c837_be3b6c19ec5842778bde5634da6edbf4.pdf
    • https://static.usrfiles.com/ugd/9c43ec_ead25173b3804d5e8c87c68c76ee0dde.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_off000040e1.bin
2f4cc6458c56c34b842b3bf2243dcc5d60cce2a1dd858011b534fc96b0bbac70		 pdf-font-stream PDF embedded font (sfnt) at offset 0x40E1 5144 bytes
font_01_sfnt_off00005278.bin
fd7dfeb6a6d8187b695a7fc8aff4f632020d908fd25440778d036408e97dac7c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5278 9864 bytes

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