Malicious PDF — malware analysis report

Static analysis result for SHA-256 757a63c449a537d9…

MALICIOUS

PDF

42.5 KB Created: 2020-08-30 01:05:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a2e27f3a170eb69ab2d1114144fcae8f SHA-1: a8f47deb22065e029a7d8612419c8963f6830901 SHA-256: 757a63c449a537d901afd72a8b1e81617f064e0759a6720ebf5cfba37b5ba2ce
154 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded links, many of which point to benign Shopify URLs, but one critical link directs to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains the malicious URL, suggesting an attempt to disguise its true nature. The ML classifier also strongly indicated maliciousness.

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/wix?keyword=iomega+ix4+200d+manual
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/2435/8308/files/the_wheel_of_monotony.pdf
    • https://cdn.shopify.com/s/files/1/0429/4737/9356/files/great_are_you_lord_sinach_music_sheet.pdf
    • https://cdn.shopify.com/s/files/1/0438/9509/5464/files/pearson_biology_class_10.pdf
    • https://cdn.shopify.com/s/files/1/0440/6149/1365/files/al_quran_with_bangla_translation_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0434/9978/2309/files/16124848162.pdf
    • https://cdn.shopify.com/s/files/1/0433/9793/9361/files/gajevomilajofet.pdf
    • https://static.usrfiles.com/ugd/b8c837_67710c0cfd694f7d96f786230b9ed7a9.pdf
    • https://static.usrfiles.com/ugd/df4650_0f30aec160c44c76a18c6ccfe3092db0.pdf
    • https://static.usrfiles.com/ugd/b8c837_de645057731a4d4885797e5ec200911f.pdf
    • https://static.usrfiles.com/ugd/0fdb6d_f845caf439d74de39e2161f41d8dd06f.pdf
    • https://static.usrfiles.com/ugd/b8c837_f0f6d74d10bc47bdb90ccbb503061549.pdf
    • https://static.usrfiles.com/ugd/429b25_f0703aba73c743ae91fcee3d8c039382.pdf
    • https://static.usrfiles.com/ugd/39cb9d_d83ae10cf12d4cb88c321e2ee3d25892.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_off00006892.bin
345a510ca1b242fa6fef834f6cb41865faa8c52ea89cd8d5ccef44dd0d27aaf9
pdf-font-stream PDF embedded font (sfnt) at offset 0x6892 5236 bytes
font_01_sfnt_off00007a66.bin
da7cbb15a4ae09d601ce65e1f46f099503f54f8277b78346fcd64afdf2317fa1
pdf-font-stream PDF embedded font (sfnt) at offset 0x7A66 10400 bytes