Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed61440b260d7134…

MALICIOUS

PDF

31.3 KB Created: 2020-08-23 20:06:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0fff6b72efd73ae4f49770418eecc36a SHA-1: f2319ce965de868620a3d67851cf6ee5e733ab69 SHA-256: ed61440b260d713492f3be8a563ef1b113d4ba65031a360a1dd2c914d9e8db29
152 Risk Score

Malware Insights

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

The PDF file contains a significant number of embedded links, with one identified as a known malicious redirector. The ML classifier also strongly indicated maliciousness. The primary attack pattern involves redirecting users to potentially harmful external sites, likely for phishing or malware delivery. No scripts were extracted, limiting the analysis of specific execution behaviors.

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.cc/pify?keyword=rcog+guidelines+hyperemesis
    • http://files.strippeddown.net/uploads/1/3/0/8/130814594/46bd171d30c.pdf
    • http://sakoritez.cubiccompass.com/uploads/1/3/0/7/130740145/104156f1ce.pdf
    • https://cdn.shopify.com/s/files/1/0430/4083/3690/files/lupamawifotisalebo.pdf
    • https://cdn.shopify.com/s/files/1/0445/4265/6671/files/piladopuvevikarevizez.pdf
    • https://cdn.shopify.com/s/files/1/0435/3291/0751/files/zajozalatefotisaka.pdf
    • https://cdn.shopify.com/s/files/1/0437/5665/0645/files/vubaxusofipuxamalig.pdf
    • https://cdn.shopify.com/s/files/1/0428/3236/3676/files/wipobimubomaxaka.pdf
    • https://cdn.shopify.com/s/files/1/0434/2897/0647/files/petsmart_grooming_promo_code.pdf
    • https://cdn.shopify.com/s/files/1/0433/2794/6904/files/17132895393.pdf
    • https://cdn.shopify.com/s/files/1/0433/6022/3382/files/examiner_report_cie_pakistan_studies_2017.pdf
    • https://cdn.shopify.com/s/files/1/0436/9547/2793/files/an_etymological_dictionary_of_the_latin_language.pdf
    • https://cdn.shopify.com/s/files/1/0430/8051/5745/files/62528568383.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_off000040b0.bin
f8b36c9b5c0f658f8def988d7a51f23f5fcc2cd085b16515671e5681024b8dea
pdf-font-stream PDF embedded font (sfnt) at offset 0x40B0 5388 bytes
font_01_sfnt_off000052df.bin
ebd1b332bbbe9fc1afb94c7512ce3a3000faf79bfe506b08e065554ef52b1aed
pdf-font-stream PDF embedded font (sfnt) at offset 0x52DF 8760 bytes