Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b95e97e5fdcbf04…

MALICIOUS

PDF

46.0 KB Created: 2020-08-06 14:40:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 652f8639e2ddf0ee891e37cc707171cd SHA-1: 18bbe80342abd307f6aaf70c98275f6e4ea454d3 SHA-256: 5b95e97e5fdcbf04e9d02349c0cde8236bcd636fb9c3a1c903f6ed785850a8f0
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a link farm designed to redirect users to potentially malicious content. One critical heuristic identified a link to known malicious redirector infrastructure. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the overall structure suggests a phishing or redirection attempt.

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/pify?keyword=bovine+serum+albumin+merupakan+pdf
    • http://files.whitegallowaysofwayby.com/uploads/1/3/0/8/130873907/fewubogukobavel-sixomolimu-mifip.pdf
    • http://files.phsboosters.org/uploads/1/3/1/4/131437725/masulagem_bumumazulitowe_jaxabuso.pdf
    • http://files.tanninglotionsdirect.com/uploads/1/3/2/3/132303205/tivuto.pdf
    • http://files.yauponberrypress.com/uploads/1/3/1/3/131380107/9075793.pdf
    • http://zojawe.victoriacookson.com/uploads/1/3/0/7/130775734/4016052.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/5557/0341/files/98983782862.pdf
    • https://cdn.shopify.com/s/files/1/0434/6612/9574/files/gimabilet.pdf
    • https://cdn.shopify.com/s/files/1/0431/3802/3581/files/download_views_from_the_6_drake.pdf
    • https://cdn.shopify.com/s/files/1/0434/0344/4380/files/runir_deux_en_ligne.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/32878299647.pdf
    • https://cdn.shopify.com/s/files/1/0438/2064/6562/files/9259522351.pdf
    • https://cdn.shopify.com/s/files/1/0439/9408/7582/files/68326638853.pdf
    • https://cdn.shopify.com/s/files/1/0429/3971/1655/files/16913765191.pdf
    • https://cdn.shopify.com/s/files/1/0432/2839/7727/files/kiefer_sutherland_net_worth.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/dedagefegumam.pdf
    • https://cdn.shopify.com/s/files/1/0431/6656/4520/files/ziwimudomosofin.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_off000067c1.bin
447013c7c713f8d4f3110bd2960c6767d37734c944ef0b3a0d7d5c361c820c50		 pdf-font-stream PDF embedded font (sfnt) at offset 0x67C1 5500 bytes
font_01_sfnt_off00007a62.bin
8e35ccbdf8fc1cf74e24d5dfaf96ce5901f6c524c1d7acb9e78e9b0e86ecfa00		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A62 15460 bytes

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