Malicious PDF — malware analysis report

Static analysis result for SHA-256 65e2bd8ac82bd472…

MALICIOUS

PDF

48.0 KB Created: 2020-07-30 23:15:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c9e9e1902486ae82896ab62724ae75eb SHA-1: 5a3dea21e5bd821db38ac270c6a4d87784a824af SHA-256: 65e2bd8ac82bd472e97cfebd591b06d709cf22171b5f8ced9d74d4243874f6c8
154 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 known malicious redirector. The ML classifier strongly flagged this PDF as malicious, and the presence of a link farm suggests an attempt to distribute malicious content or phish users. No scripts were extracted, but the embedded links are the primary indicators of malicious intent.

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=bryum+argenteum+pdf
    • http://files.wolfesearchgroup.com/uploads/1/3/1/3/131398010/niwokomaxotewefo.pdf
    • http://files.radsinternational.com/uploads/1/3/2/7/132712006/kerasivimo_tuwuridusuxig.pdf
    • http://files.thejonesfarmvt.com/uploads/1/3/0/7/130740033/897e63b2f0401.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/8070/4405/files/86422561520.pdf
    • https://cdn.shopify.com/s/files/1/0427/6797/4556/files/pumirumevoxo.pdf
    • https://cdn.shopify.com/s/files/1/0437/2211/3192/files/lifazenidenisanelozog.pdf
    • https://cdn.shopify.com/s/files/1/0432/7945/0272/files/15555512200.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/pamuzinesikajojefex.pdf
    • https://cdn.shopify.com/s/files/1/0430/8893/7120/files/notetufukapumunuj.pdf
    • https://cdn.shopify.com/s/files/1/0432/3426/3199/files/81654097138.pdf
    • https://cdn.shopify.com/s/files/1/0437/0015/8632/files/87833138374.pdf
    • https://cdn.shopify.com/s/files/1/0436/0473/8206/files/dipakikulewefamezigop.pdf
    • https://cdn.shopify.com/s/files/1/0434/0590/1991/files/fewarumanomosilosaritu.pdf
    • https://cdn.shopify.com/s/files/1/0429/1988/7001/files/tabimegawaxediziruf.pdf
    • https://cdn.shopify.com/s/files/1/0433/6202/5624/files/42913082451.pdf
    • https://cdn.shopify.com/s/files/1/0429/6219/0489/files/47236378763.pdf
    • https://cdn.shopify.com/s/files/1/0437/9086/0437/files/40962075026.pdf
    • https://cdn.shopify.com/s/files/1/0434/4184/8470/files/72480724584.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_off00007a3b.bin
849387bc273cd01fff97691cc8063274dd46092bd8fbab9ec5d661f9f0ad2fa8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A3B 5024 bytes
font_01_sfnt_off00008b39.bin
3d0dc5e49d140f9d4d71137c5a74f2cdfa234a81c58495a96acefc26c3bc7e12		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8B39 12412 bytes

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