Malicious PDF — malware analysis report

Static analysis result for SHA-256 66837315421c3ce4…

MALICIOUS

PDF

44.5 KB Created: 2020-07-19 20:42:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-09-04
MD5: 54c55f548c62d5c8996e447b173a6371 SHA-1: 9cd15b9f30e3fff0a42432c7dcd1d3626bf0f2e0 SHA-256: 66837315421c3ce45d63ef435d052797b60a255d3d0c341527c417bd5a07f584
194 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded links designed to create an SEO link farm, directing users to various PDF files. One of the primary redirector URLs is https://ttraff.ru/wb?keyword=sears%20snowblower%20manuals, which is flagged as malicious. The document body text is heavily obfuscated and appears to be a lure related to "Sears snowblower manuals". No scripts were extracted from this sample.

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.
  • 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.
  • 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/wb?keyword=sears%20snowblower%20manuals In PDF document text
    • http://files.hunterdongardenguild.org/uploads/1/3/1/3/131380305/fapelawilodu_begixugexef_dafixofa.pdfIn PDF document text
    • http://files.rolypolyproductions.com/uploads/1/3/0/9/130969377/e60e4686.pdfIn PDF document text
    • http://files.controllerspages.com/uploads/1/3/0/8/130813851/841564.pdfIn PDF document text
    • http://files.masstec.org/uploads/1/3/2/3/132303138/tatiraxeno_gupukitekezev_japawibe_zenanotozerepet.pdfIn PDF document text
    • http://files.animalfineart.co.uk/uploads/1/3/0/9/130969965/muxeru.pdfIn PDF document text
    • http://files.artlynchactingcoach.com/uploads/1/3/1/3/131380868/tagaxe.pdfIn PDF document text
    • http://files.mensanapsychology.com/uploads/1/3/1/3/131398000/buzijedi_muzezo_kerewuke_fikupej.pdfIn PDF document text
    • http://files.jenningsrn-to-bsn.com/uploads/1/3/2/7/132710669/2650436.pdfIn PDF document text
    • http://files.pickinstick.com/uploads/1/3/1/3/131380251/c3ea1d68.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://fizavezekef.files.wordpress.com/2020/07/direjed.pdfIn PDF document text
    • https://lutomuwo.files.wordpress.com/2020/06/96057523731.pdfIn PDF document text
    • https://jajexulobuta.files.wordpress.com/2020/06/raragukuzu.pdfIn PDF document text
    • https://mijitesedi486084253.files.wordpress.com/2020/07/xokevifimovudabadijo.pdfIn PDF document text
    • https://rogejema707534438.files.wordpress.com/2020/07/69489905035.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/3179/7668/files/52790064602.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/0916/2907/files/68135444797.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/7441/2949/files/16760983465.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/3849/8206/files/56470790330.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/8027/7406/files/61112215647.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/sopituwoxo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/45560821546.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/7018/5879/files/68821879779.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007220.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7220 4920 bytes
SHA-256: a2aa0078b73c30c336474b70d0b0478b911f90e64a2ce2806443b4d9cf847ca4
font_01_sfnt_off000082bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x82BF 9868 bytes
SHA-256: 56c8fcefbe43a32ed6e692951ccbac91c618b0ca26e505b06430755fb76f495a