Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c5fb2eb84cb17c7…

MALICIOUS

PDF

84.7 KB Created: 2020-09-05 11:32:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 03089fd382d683f31180a9d22ab862e7 SHA-1: bcc87f9c8f962afe9e9b9cc6e33d10ee1b449a92 SHA-256: 5c5fb2eb84cb17c7f65423e6b4d352356caf338dd1ac73ec3890c31a5d6985e4
154 Risk Score

Malware Insights

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

The PDF contains embedded links that point to a known malicious redirector, indicating an attempt to lead the user to malicious content. The document body, though heavily obfuscated, contains text related to 'gestational hypertension guidelines 2018' and a URL, suggesting a lure. The ML classifier also strongly flagged this PDF 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.ru/wix?keyword=gestational+hypertension+guidelines+2018
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/5247/4267/files/80733382598.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/96989945255.pdf
    • https://cdn.shopify.com/s/files/1/0439/0918/5688/files/758218083.pdf
    • https://cdn.shopify.com/s/files/1/0436/4946/6526/files/ff14_anima_weapons.pdf
    • https://cdn.shopify.com/s/files/1/0431/5820/8672/files/pesisidodixuvutusiperegu.pdf
    • https://cdn.shopify.com/s/files/1/0430/0364/2007/files/43437893283.pdf
    • https://cdn.shopify.com/s/files/1/0436/6408/1046/files/54320360710.pdf
    • https://cdn.shopify.com/s/files/1/0431/2567/0042/files/dividing_whole_number_by_fractions_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0443/8904/0294/files/world_hardest_math_problem_with_answer.pdf
    • https://cdn.shopify.com/s/files/1/0434/2281/0263/files/zefozovukutudopafazo.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/3789128943.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_off0000ff9f.bin
9fe526b0b11cd4407822ac7627948be9032d78e9156c3b4f83146194120132e4
pdf-font-stream PDF embedded font (sfnt) at offset 0xFF9F 5872 bytes
font_01_sfnt_off000113a2.bin
f5c17698dda89025b31d9b8e8145b9eea9038cf93db7e69a7012e8ef9473dc90
pdf-font-stream PDF embedded font (sfnt) at offset 0x113A2 16244 bytes