Malicious PDF — malware analysis report

Static analysis result for SHA-256 03d3b488b84dcb07…

MALICIOUS

PDF

35.9 KB Created: 2020-08-06 05:42:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 11c156291771577032e271e7b215cf2c SHA-1: c15762be141876b07f4a7f1e8659f5b5412f22bb SHA-256: 03d3b488b84dcb0729049a85d6802148dea465ec124fb2fd3be3f903f77c4fc7
162 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains a URL that appears to be a lure for downloading a dictionary, which is then linked to a redirector. The ML classifier also strongly flagged this PDF as malicious.

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=oxford+dictionary+english+to+marathi+free+download+pdf
    • http://nebom.tellyourstory.today/uploads/1/3/0/7/130775129/pedinofitarov.pdf
    • http://vafega.shoptaorminajewelry.com/uploads/1/3/1/6/131636664/6298806.pdf
    • http://files.aroundtheworldin800days.com/uploads/1/3/1/4/131437438/9892ac447ea867b.pdf
    • http://kivir.thirtynfree.com/uploads/1/3/1/8/131856919/6b63559.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/3189/4944/files/paboridafosavofadaji.pdf
    • https://cdn.shopify.com/s/files/1/0432/4674/7803/files/44854217073.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/22411539251.pdf
    • https://cdn.shopify.com/s/files/1/0436/9540/7269/files/boyka_o_imbat_c3_advel_cover.pdf
    • https://cdn.shopify.com/s/files/1/0437/4868/8033/files/boxesetazoz.pdf
    • https://cdn.shopify.com/s/files/1/0427/8901/1612/files/pusomox.pdf
    • https://cdn.shopify.com/s/files/1/0435/9448/1823/files/zegarorojiv.pdf
    • https://cdn.shopify.com/s/files/1/0428/8148/2918/files/goruxelone.pdf
    • https://cdn.shopify.com/s/files/1/0431/1102/2756/files/85451800325.pdf
    • https://cdn.shopify.com/s/files/1/0427/6345/2583/files/radiographic_cephalometry_jacobson.pdf
    • https://cdn.shopify.com/s/files/1/0433/8316/0995/files/69583578508.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_off00004e86.bin
c990b9cc31fb4360d83fa52604b537917f86bc70b5454fbfedeb20dee545b949		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4E86 5860 bytes
font_01_sfnt_off00006268.bin
db53be64534ef0b6688f8363da424b3739b7a5c0af71e386f41b7e2c9a6111d7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6268 9456 bytes

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