Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4ebadd6ac91b43b…

MALICIOUS

PDF

44.9 KB Created: 2020-08-04 16:03:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e08719dfdf0e12fa5162f08765eb7e2d SHA-1: 2b53142f4b273abdf8a41cfee99e0616553d4fad SHA-256: d4ebadd6ac91b43b254175f7db5642849ffe56d8c589af4678697847e84b1d25
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector. The document body, though partially corrupted, includes the target URL and references a book title, suggesting a lure to trick users into clicking the malicious link. The ML classifier strongly flagged this PDF as malicious, and the presence of a redirector link indicates an attempt to lead the user to a harmful site.

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=a+wrinkle+in+time+pdf+chapter+4
    • http://files.francisbongiovannilaw.com/uploads/1/3/1/4/131438324/e6676473.pdf
    • http://files.madisonmedium.com/uploads/1/3/2/6/132680796/xanab-lasovudufu.pdf
    • http://files.alotusheart.org/uploads/1/3/1/3/131383743/pezubobetajutokumaza.pdf
    • http://files.kariemsaleh.de/uploads/1/3/1/3/131382243/linukagane.pdf
    • https://cdn.shopify.com/s/files/1/0435/8003/1135/files/mijopobuguxorerigi.pdf
    • https://cdn.shopify.com/s/files/1/0431/6702/3253/files/lizomalakobuf.pdf
    • https://cdn.shopify.com/s/files/1/0430/3316/5986/files/94398138056.pdf
    • https://cdn.shopify.com/s/files/1/0428/2174/6847/files/30149209831.pdf
    • https://cdn.shopify.com/s/files/1/0433/9220/4950/files/pefodix.pdf
    • https://cdn.shopify.com/s/files/1/0437/0956/3029/files/16_degrees_43_minutes_north.pdf
    • https://cdn.shopify.com/s/files/1/0428/5225/3863/files/zapizeva.pdf
    • https://cdn.shopify.com/s/files/1/0429/5986/3961/files/serato_scratch_live_download.pdf
    • https://cdn.shopify.com/s/files/1/0431/6761/3087/files/17326442810.pdf
    • https://cdn.shopify.com/s/files/1/0437/2247/3624/files/91548149997.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000732e.bin
f3cb4a19006d2c4ceb2ecb7414e74337af8005c87e2c3b18bd66d9086ab0f3c0
pdf-font-stream PDF embedded font (sfnt) at offset 0x732E 5452 bytes
font_01_sfnt_off000085a6.bin
213639d8abc2d14dafc3c96a1545f621f2c3a201596becbb2ea1643e3411c7eb
pdf-font-stream PDF embedded font (sfnt) at offset 0x85A6 9860 bytes