Malicious PDF — malware analysis report

Static analysis result for SHA-256 637ac7d94bcf1600…

MALICIOUS

PDF

48.1 KB Created: 2020-08-02 11:46:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a2d512b6ae7dc380777e522df1fb7aa8 SHA-1: 313b7f2d9b715076d141a9e8a41b0bdfe01d149c SHA-256: 637ac7d94bcf1600a04765a5cfec48cb8d9deb0217d464bcc1cfd631112a5c58
162 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure, specifically 'https://ttraff.ru/pify?keyword=crhp+manual+online'. Additionally, it exhibits characteristics of a PDF link farm, with numerous external links, many pointing to Shopify domains. The presence of a 'download button' lure further supports a malicious intent to redirect users to 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=crhp+manual+online
    • http://files.mindmadekc.com/uploads/1/3/2/7/132740412/kuteseteja_vedavajozoj_wupijegogazono_sotupa.pdf
    • http://files.psychometricdynamics.com/uploads/1/3/1/3/131382032/4e6f419d31e.pdf
    • http://files.cuttingedgehealthteam.org/uploads/1/3/2/6/132696483/9922588.pdf
    • http://files.mooipermanentemakeup.com/uploads/1/3/1/4/131453713/winalepedosajup.pdf
    • http://files.wildabouthomefoodtravel.com/uploads/1/3/2/6/132680994/lebibijuvofaxew.pdf
    • http://fontawesome.iohttp://fontawesome.io/license/
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/9037/8903/files/pufosonutumap.pdf
    • https://cdn.shopify.com/s/files/1/0439/1020/1499/files/96162342766.pdf
    • https://cdn.shopify.com/s/files/1/0428/7997/5590/files/nwa_and_the_posse.pdf
    • https://cdn.shopify.com/s/files/1/0432/0041/3856/files/pabitutabifuz.pdf
    • https://cdn.shopify.com/s/files/1/0431/1678/9927/files/pifekinapider.pdf
    • https://cdn.shopify.com/s/files/1/0432/6401/6539/files/muvezatenezekafamu.pdf
    • https://cdn.shopify.com/s/files/1/0427/9032/2342/files/jitapuraros.pdf
    • https://cdn.shopify.com/s/files/1/0428/8266/2553/files/tabajowupivoras.pdf
    • https://cdn.shopify.com/s/files/1/0428/0333/1231/files/pebupa.pdf
    • https://cdn.shopify.com/s/files/1/0436/1289/7437/files/70198534954.pdf
    • https://cdn.shopify.com/s/files/1/0432/9121/3988/files/84239478197.pdf
    • https://cdn.shopify.com/s/files/1/0430/0632/8995/files/fosavalow.pdf
    • https://cdn.shopify.com/s/files/1/0429/7677/2250/files/tukoviwezusepiluzop.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007634.bin
29deba922b25affade197b91cabcf3deafc5158e50ae35c625fd690a20206674		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7634 1764 bytes
font_01_sfnt_off00007edd.bin
739f54ba10671d7acea5c8441c718851688e824ad9b194140d2014f95952f73b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7EDD 4784 bytes
font_02_sfnt_off00008eef.bin
0a47aa2dc248f3999769b37f546c2daa4b327a60db9683cb209c20c1eb5e46f1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8EEF 10504 bytes

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