Malicious PDF — malware analysis report

Static analysis result for SHA-256 035693d71051de2c…

MALICIOUS

PDF

39.7 KB Created: 2020-08-30 01:09:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3fff6f46569e19b379618041afda3d76 SHA-1: bb03fb32629b67167b3aa2071ad68732346b087a SHA-256: 035693d71051de2cd673c017f3bf036185ae5ca346fef778bc8331e5d23f7391
154 Risk Score

Malware Insights

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

This PDF document contains numerous embedded links, with one specifically identified as a malicious redirector. The document body, though heavily obfuscated, contains text related to an essay organizer, suggesting a lure to disguise the malicious intent. The presence of a link farm and a critical heuristic firing for a malicious redirector indicates a high likelihood of this document being used for phishing or malware distribution.

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/wix?keyword=five+paragraph+essay+graphic+organizer
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/af0aa9_8f2e41b7ed6b4cd79935681b2b95541e.pdf
    • https://static.usrfiles.com/ugd/a59130_5cac3bc173a94012b92550ce6423d6a6.pdf
    • https://static.usrfiles.com/ugd/b8c837_7fb9aedc51804b0da9bd5ac73ec33ef4.pdf
    • https://cdn.shopify.com/s/files/1/0437/4088/9242/files/12831478852.pdf
    • https://cdn.shopify.com/s/files/1/0449/0749/5591/files/korefotar.pdf
    • https://cdn.shopify.com/s/files/1/0429/8833/9361/files/jomipebapapitiduwak.pdf
    • https://static.usrfiles.com/ugd/b8c837_df24a06df2f44b859cb8fb66363b8e8f.pdf
    • https://static.usrfiles.com/ugd/3b47cb_21ede6ae70624457bad1c2a568f91d88.pdf
    • https://cdn.shopify.com/s/files/1/0437/6877/4814/files/85805741100.pdf
    • https://cdn.shopify.com/s/files/1/0430/4509/3533/files/65135667637.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005e1a.bin
24f7f455cb7f6fe43f599aaeb603304497645c88d9c1d802720a09966b004a93		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5E1A 5332 bytes
font_01_sfnt_off00007050.bin
3f593b86dd19f69fed210b0713a8e8633fd9acced5663b259f147e5c3d1d01b0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7050 10312 bytes

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