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) First seen: 2026-05-09
MD5: a2d512b6ae7dc380777e522df1fb7aa8 SHA-1: 313b7f2d9b715076d141a9e8a41b0bdfe01d149c SHA-256: 637ac7d94bcf1600a04765a5cfec48cb8d9deb0217d464bcc1cfd631112a5c58
202 Risk Score

Malware Insights

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

The PDF contains multiple heuristics indicating malicious intent, including a redirector link and a link farm designed for SEO manipulation. The document body, though obfuscated, contains a URL that matches the redirector found in the heuristics. The presence of numerous embedded links, many pointing to benign Shopify domains but some to unknown hosts, suggests an attempt to distribute malicious content or phish users. The ML classifier strongly supports the malicious verdict.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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 In PDF document text
    • http://files.mindmadekc.com/uploads/1/3/2/7/132740412/kuteseteja_vedavajozoj_wupijegogazono_sotupa.pdfIn PDF document text
    • http://files.psychometricdynamics.com/uploads/1/3/1/3/131382032/4e6f419d31e.pdfIn PDF document text
    • http://files.cuttingedgehealthteam.org/uploads/1/3/2/6/132696483/9922588.pdfIn PDF document text
    • http://files.mooipermanentemakeup.com/uploads/1/3/1/4/131453713/winalepedosajup.pdfIn PDF document text
    • http://files.wildabouthomefoodtravel.com/uploads/1/3/2/6/132680994/lebibijuvofaxew.pdfIn PDF document text
    • http://fontawesome.iohttp://fontawesome.io/license/In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/9037/8903/files/pufosonutumap.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/1020/1499/files/96162342766.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/7997/5590/files/nwa_and_the_posse.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/0041/3856/files/pabitutabifuz.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/1678/9927/files/pifekinapider.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/6401/6539/files/muvezatenezekafamu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/9032/2342/files/jitapuraros.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/8266/2553/files/tabajowupivoras.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/0333/1231/files/pebupa.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/1289/7437/files/70198534954.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/9121/3988/files/84239478197.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/0632/8995/files/fosavalow.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/7677/2250/files/tukoviwezusepiluzop.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007634.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7634 1764 bytes
SHA-256: 29deba922b25affade197b91cabcf3deafc5158e50ae35c625fd690a20206674
font_01_sfnt_off00007edd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7EDD 4784 bytes
SHA-256: 739f54ba10671d7acea5c8441c718851688e824ad9b194140d2014f95952f73b
font_02_sfnt_off00008eef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8EEF 10504 bytes
SHA-256: 0a47aa2dc248f3999769b37f546c2daa4b327a60db9683cb209c20c1eb5e46f1