Malicious PDF — malware analysis report

Static analysis result for SHA-256 837453761d7a8407…

MALICIOUS

PDF

44.3 KB Created: 2020-08-20 19:28:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6edbbe61d24b58f92987b1edd54174c9 SHA-1: 8de872ca16eed94ba936497353a1c703b6a86046 SHA-256: 837453761d7a84077be77baf130c8275ad5738b0504db1a8331d9fd6b6b041c3
162 Risk Score

Malware Insights

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

The PDF contains embedded links, with one identified as a malicious redirector. The ML classifier strongly flagged this PDF as malicious, and heuristics indicate it's part of a link farm. The presence of a download button lure further supports a malicious intent to redirect users to potentially harmful content.

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.ru/pify?keyword=axes+io+hile+apk+day%25C4%25B1
    • http://files.firstaidmissionsofhope.com/uploads/1/3/1/8/131871633/823741c7740.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/9316/4181/files/roperow.pdf
    • https://cdn.shopify.com/s/files/1/0440/8098/8325/files/46638878884.pdf
    • https://cdn.shopify.com/s/files/1/0428/9275/5103/files/bokujagonukadose.pdf
    • https://cdn.shopify.com/s/files/1/0432/4474/8950/files/973065489.pdf
    • https://cdn.shopify.com/s/files/1/0429/8273/6031/files/ccvc_words_worksheets.pdf
    • https://cdn.shopify.com/s/files/1/0428/3046/3135/files/23664360202.pdf
    • https://cdn.shopify.com/s/files/1/0429/9456/5271/files/78251659804.pdf
    • https://cdn.shopify.com/s/files/1/0427/4746/1788/files/kibudalobo.pdf
    • https://cdn.shopify.com/s/files/1/0434/4355/2416/files/velekuraj.pdf
    • https://cdn.shopify.com/s/files/1/0428/9842/3967/files/95590756916.pdf
    • https://cdn.shopify.com/s/files/1/0428/5435/1015/files/95887657591.pdf
    • https://cdn.shopify.com/s/files/1/0440/6122/9206/files/fukibixutizewojig.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_off00005896.bin
5118e6b689211647bcee52f2e6fba3bc2196c173d86114b985dbaa81f07ca8d4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5896 5208 bytes
font_01_sfnt_off00006a4f.bin
aea702595e29c8af1d02bd8b5f9fd2100187da61975322337540fcf188f5dccd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6A4F 10204 bytes
font_02_sfnt_off00008d65.bin
22e3ed72ec786726e24aeec7aff45d373814b70caf4fc246d2ab4bb179c318f6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8D65 16208 bytes

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