Malicious PDF — malware analysis report

Static analysis result for SHA-256 62939884cc9e1870…

MALICIOUS

PDF

43.7 KB Created: 2020-08-26 10:33:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5f92ec1580c5301e0e4a6487b9129f7e SHA-1: b65e587b08c5b016c4f0801ee07cebabd63225c3 SHA-256: 62939884cc9e18707a9290df98434aaeb36046621dea550d8ba8a12dc39d6bc0
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a significant number of embedded links, identified as a link farm, with at least one pointing to known malicious redirector infrastructure. The ML classifier also strongly indicated maliciousness. The primary purpose appears to be directing users to potentially harmful external sites, likely for phishing or malware delivery.

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=vocabulary+packets+greek+and+latin+r
    • http://files.paraspear.com/uploads/1/3/2/8/132815367/walikam.pdf
    • http://vokobi.safehavensavings.org/uploads/1/3/2/7/132712615/4312637.pdf
    • http://files.theogkicks.co/uploads/1/3/1/8/131856723/guvapuk_vuwigokif_jagakoxuz.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/5489/0149/files/fraction_word_problems_adding_and_subtracting_worksheets.pdf
    • https://cdn.shopify.com/s/files/1/0433/8037/5708/files/wondershare_editor_ocr_plugin.pdf
    • https://cdn.shopify.com/s/files/1/0429/9050/2042/files/early_vedic_period_and_later_vedic_period.pdf
    • https://cdn.shopify.com/s/files/1/0434/4935/2349/files/vujijemofalu.pdf
    • https://cdn.shopify.com/s/files/1/0428/4222/6854/files/5479827519.pdf
    • https://cdn.shopify.com/s/files/1/0448/3137/5521/files/textbook_of_biochemistry_biophysics_for_nurses_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/62042090741.pdf
    • https://cdn.shopify.com/s/files/1/0441/1952/3480/files/drools_getting_started_guide.pdf
    • https://cdn.shopify.com/s/files/1/0436/0162/5252/files/pineapple_cake_images_hd.pdf
    • https://cdn.shopify.com/s/files/1/0433/9249/9877/files/44537621431.pdf
    • https://cdn.shopify.com/s/files/1/0433/0917/0856/files/internet_explorer_free_for_android_phone.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_off0000615e.bin
30348aeb3f9b60339aa28526e0e199d33cb3a26b88cec949be273c1373b3b30c
pdf-font-stream PDF embedded font (sfnt) at offset 0x615E 5512 bytes
font_01_sfnt_off00007423.bin
a4b702b6bc0218d88ed7639d66b62887fea3ea0b5f634b968c9bec6aa25fe0d6
pdf-font-stream PDF embedded font (sfnt) at offset 0x7423 15188 bytes