Malicious PDF — malware analysis report

Static analysis result for SHA-256 6cd03c03c1e16215…

MALICIOUS

PDF

65.6 KB Created: 2020-08-14 14:25:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e64f195efd677920e4e56dbb4e8b9852 SHA-1: 0fe97c9efd3d7107358887194240af775a2ee50b SHA-256: 6cd03c03c1e16215b52ffb9dc558bfcbb4636873c886b6508e189ca7f17ad3f3
154 Risk Score

Malware Insights

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

The PDF contains a deceptive link masquerading as driving test questions, which redirects to a malicious URL. The document also hosts a large number of links to external PDFs, many of which are hosted on Shopify, suggesting a link farm or SEO manipulation tactic. The ML classifier strongly indicated maliciousness, and the primary redirector URL is flagged as malicious.

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=nj+driving+test+questions+and+answers+2019
    • http://files.jberaeroclub.com/uploads/1/3/0/9/130969535/2ff3fb5a4.pdf
    • http://bevakot.kitchengadgetvegan.com/uploads/1/3/1/6/131606349/pusuba.pdf
    • http://files.encircledbirth.com/uploads/1/3/2/7/132740435/2629563.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/5671/7207/files/zukejegemakirunof.pdf
    • https://cdn.shopify.com/s/files/1/0434/1887/8114/files/warhammer_dwarf_army_book_8th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0441/4645/8776/files/48340951340.pdf
    • https://cdn.shopify.com/s/files/1/0433/2149/1621/files/bidikujemuwepajodo.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/94448736580.pdf
    • https://cdn.shopify.com/s/files/1/0431/3251/8549/files/480522412.pdf
    • https://cdn.shopify.com/s/files/1/0434/8595/4198/files/49442358401.pdf
    • https://cdn.shopify.com/s/files/1/0430/3169/1421/files/46673256339.pdf
    • https://cdn.shopify.com/s/files/1/0431/1715/0368/files/15951410295.pdf
    • https://cdn.shopify.com/s/files/1/0434/8719/9394/files/xesuwogegijaj.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/telisupuf.pdf
    • https://cdn.shopify.com/s/files/1/0430/7661/6353/files/loksatta_epaper_nagpur.pdf
    • https://cdn.shopify.com/s/files/1/0435/2330/9727/files/30135551033.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_off0000bf0b.bin
052a8a1eacac25775a88681ad8bf20bcaa8ac82b90606a9a9ea68ece800ce4bf
pdf-font-stream PDF embedded font (sfnt) at offset 0xBF0B 5764 bytes
font_01_sfnt_off0000d2d7.bin
a085b391e6eb757a2700babb60abc3218d147f6e6cb25d451e33378d4cc37c3e
pdf-font-stream PDF embedded font (sfnt) at offset 0xD2D7 11424 bytes