Malicious PDF — malware analysis report

Static analysis result for SHA-256 18dafdf16fa3ef7e…

MALICIOUS

PDF

40.2 KB Created: 2020-09-02 01:32:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dea55959b29ba6947cdb305c8a1bbcfa SHA-1: d3894a7c7557bf1c5bca87d460c2d46308863c98 SHA-256: 18dafdf16fa3ef7e4ac3991c98e2713357ea75aa89bd16f33c7e22b293070f9a
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a prominent link that redirects to a known malicious domain, masquerading as a worksheet download. This indicates a phishing or social engineering attempt to redirect the user to malicious content. The ML classifier also strongly flagged this PDF as malicious, supporting the observed malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/wix?keyword=arabic+script+worksheets
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/ef7b09_78a5105837fb456883d87b508fb11c50.pdf
    • https://static.usrfiles.com/ugd/4dd980_87f539ae5a904cfeb125d09f00c575ff.pdf
    • https://static.usrfiles.com/ugd/4dd980_b3f716fd50c64a07b6c4b0a6a36c2692.pdf
    • https://static.usrfiles.com/ugd/57c819_f1b11efdc44e49e3a0243d386b9fad4a.pdf
    • https://static.usrfiles.com/ugd/b13fd1_016afbf0120543deb9d93e345d7fbd7b.pdf
    • https://static.usrfiles.com/ugd/b8c837_5ef510d21cea40feb2e98415b686354f.pdf
    • https://static.usrfiles.com/ugd/917232_1d92ef5de401448cb1263964eb263275.pdf
    • https://static.usrfiles.com/ugd/55f640_9673522d23a84652a5976e0efba2833d.pdf
    • https://static.usrfiles.com/ugd/cc089a_4bc814d66f30440a8869b32b1b01b2b1.pdf
    • https://static.usrfiles.com/ugd/d162e3_252044cd53494795bc2f9f39d2e6b192.pdf
    • https://static.usrfiles.com/ugd/11f207_e8d915d60e3544f0a47b4fd56360eb56.pdf
    • https://static.usrfiles.com/ugd/f7fbc8_add04c8c7f2c40d0997b30f4d0c5fb94.pdf
    • https://static.usrfiles.com/ugd/850f07_61d5968ca6504d89a5cf1b15d82f268a.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004902.bin
bba40f94cfe61a6a8769e1e689bd5a817dad8563de24c43586e41af8d830ebcf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4902 5272 bytes
font_01_sfnt_off00005af9.bin
51e64c58ff7c869a1a670d42072fb8a2ee69729b7efb9327b0fb816f2d26988f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5AF9 9892 bytes
font_02_sfnt_off00007d21.bin
6738aa9883087a132a694d17c2a5eeb6d67d5cc31725471f004457ce0379ee06		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7D21 16728 bytes

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