Malicious PDF — malware analysis report

Static analysis result for SHA-256 670a6c2d714baa3f…

MALICIOUS

PDF

40.4 KB Created: 2020-09-01 00:59:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3da43619ddc09dee56c5bf9290c55221 SHA-1: d22712ca5e7b81ada33d55835b2ceced637ae985 SHA-256: 670a6c2d714baa3f760b9bad27d596c329ad5af6982613686cf6e8b2ef70d62e
162 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with one identified as a malicious redirector. The document body, though heavily obfuscated, contains text related to 'Whs safety management system template' and a URL that appears to be a lure for downloading content. The presence of a malicious redirector and numerous external links suggests an attempt to lead the user to malicious infrastructure, likely for further exploitation or phishing.

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/pify?keyword=whs+safety+management+system+template
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/429b25_14a590844266467b8960aaff92e2bb07.pdf
    • https://static.usrfiles.com/ugd/4117a9_dc190f6f17c34b2583f5371be62b1c16.pdf
    • https://static.usrfiles.com/ugd/2f3ac6_49b76a7bbf384cf7ab1beb8b5f52519f.pdf
    • https://static.usrfiles.com/ugd/b8c837_68e07adc3cec48a5ac8e7386976720b0.pdf
    • https://static.usrfiles.com/ugd/6116da_d08b8632050d4bb4895d5ca47eb2a965.pdf
    • https://static.usrfiles.com/ugd/b8c837_a6174b4b10694f6aaf6d5218462505bf.pdf
    • https://static.usrfiles.com/ugd/1849a1_f4a3b7929bf548b083bcf78a59281c22.pdf
    • https://static.usrfiles.com/ugd/850f07_edda2871653742d989e37c67b7d559af.pdf
    • https://static.usrfiles.com/ugd/fb5067_bda4fc8f327a4fffac64b8b910355a76.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_off00005e9b.bin
37ab6372029565fd814c41b6cc0524ae21d511982f94b58093303f88ecff459c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5E9B 5332 bytes
font_01_sfnt_off000070ba.bin
fbe3df9bb3de39b75fe371a165f9ebb5dcf0c7353ce80b671da9235665e46fdd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x70BA 10612 bytes

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