Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a16423288dfb8b5…

MALICIOUS

PDF

71.1 KB Created: 2020-08-12 10:32:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dbc399a59b450437ef0447acf013b45c SHA-1: 88cbe64915919a8b9ec0d1cb8d4755aeff9b8d27 SHA-256: 0a16423288dfb8b55de9dd1e1adfef54550a458c1c27f61d6d00440caecdbfe1
154 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to a link farm designed to manipulate search engine results. One prominent link, disguised as a tutorial, redirects to a known malicious domain. This suggests a phishing or scam attempt, likely using the document as a lure to drive traffic to malicious infrastructure.

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=unix+shell+scripting+tutorial+for+beginners+pdf
    • http://files.shesthefirstwisconsin.org/uploads/1/3/2/7/132712006/dapuvizupedana.pdf
    • http://files.amandatsam.net/uploads/1/3/1/4/131409597/fexavulaxuvusu.pdf
    • http://files.zwittyultra.com/uploads/1/3/0/7/130739169/9244614.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0437/9541/5189/files/makinawugenikesowomonis.pdf
    • https://cdn.shopify.com/s/files/1/0431/2141/0210/files/87072039903.pdf
    • https://cdn.shopify.com/s/files/1/0440/3943/8486/files/behold_a_pale_horse_download.pdf
    • https://cdn.shopify.com/s/files/1/0441/0313/9480/files/surface_area_and_volume_of_cuboid_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0430/5698/8311/files/wasidumixiti.pdf
    • https://cdn.shopify.com/s/files/1/0427/6905/5911/files/23345860696.pdf
    • https://cdn.shopify.com/s/files/1/0433/4478/9669/files/gojupozerukusilawasivu.pdf
    • https://cdn.shopify.com/s/files/1/0427/7298/8071/files/voximukifidokajokomafuvo.pdf
    • https://cdn.shopify.com/s/files/1/0433/4016/9366/files/behavior_modification.pdf
    • https://cdn.shopify.com/s/files/1/0434/6111/6064/files/94853312828.pdf
    • https://cdn.shopify.com/s/files/1/0431/0846/6845/files/aditya_hridayam_stotram_odia.pdf
    • https://cdn.shopify.com/s/files/1/0432/6978/3720/files/19708691524.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_off0000d565.bin
95e4894c2688e8da74fe453b3f80436b5438d415727a33931b05c901318fe733
pdf-font-stream PDF embedded font (sfnt) at offset 0xD565 5616 bytes
font_01_sfnt_off0000e86f.bin
f6f17e6b28ace9fae8535835813def5c188a02acfeb44b931bbb42e46c493481
pdf-font-stream PDF embedded font (sfnt) at offset 0xE86F 11604 bytes