Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e214bd0928c7ed0…

MALICIOUS

PDF

35.7 KB Created: 2020-08-06 06:49:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0f0587bb71c546d76810f832b0d4050e SHA-1: 22e8e5a5efcf6713663c505fdc0881454baf37f2 SHA-256: 9e214bd0928c7ed0cda06fd27ca7f55e553fec3f59dd6f3e0767f598ba942693
152 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, with a critical heuristic firing indicating a link to known malicious redirector infrastructure. The document body and embedded links suggest a lure related to 'English test pdf proficiency', likely intended to trick users into visiting malicious sites. The presence of a large number of external PDF links, many hosted on Shopify, further supports the link farm attack pattern. No scripts were extracted from this sample.

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=english+test+pdf+proficiency
    • http://files.hillersconfectionerysupplies.com/uploads/1/3/1/4/131437949/sudiw-vuvimagofukom-nisofejan.pdf
    • http://files.m-residencesforsale.com/uploads/1/3/1/6/131607063/449717f9.pdf
    • http://files.thevaccinationclinic.com/uploads/1/3/0/7/130740573/mikakafusaxesoxobos.pdf
    • http://files.8trackbooking.com/uploads/1/3/0/7/130740242/ganujujak.pdf
    • http://files.edgeglobalsupply.com/uploads/1/3/1/4/131438245/davozapazogotewowago.pdf
    • https://cdn.shopify.com/s/files/1/0433/6346/7414/files/matutunaroxibule.pdf
    • https://cdn.shopify.com/s/files/1/0432/8466/0380/files/difuvuluwijo.pdf
    • https://cdn.shopify.com/s/files/1/0432/2295/8248/files/leripova.pdf
    • https://cdn.shopify.com/s/files/1/0428/8475/9711/files/93478654732.pdf
    • https://cdn.shopify.com/s/files/1/0436/9874/9608/files/nuriruzib.pdf
    • https://cdn.shopify.com/s/files/1/0432/1506/1153/files/muwota.pdf
    • https://cdn.shopify.com/s/files/1/0430/3519/7602/files/jk_skyrim_lite.pdf
    • https://cdn.shopify.com/s/files/1/0430/4509/3533/files/pajiwik.pdf
    • https://cdn.shopify.com/s/files/1/0435/4100/4443/files/10877510987.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/6565103434.pdf
    • https://cdn.shopify.com/s/files/1/0427/8904/4383/files/sinopipoxilazexulabul.pdf
    • https://cdn.shopify.com/s/files/1/0432/7361/7576/files/27653093257.pdf
    • https://cdn.shopify.com/s/files/1/0434/1760/0152/files/desirifofafof.pdf
    • https://cdn.shopify.com/s/files/1/0432/7908/9824/files/bosovimelivul.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_off00004d66.bin
b8efa7f82b11f653f24b478de92275c3eec32179b5878c3bef413acce5e236e5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4D66 5268 bytes
font_01_sfnt_off00005f64.bin
cd888645f1f770c5f4d124809bd0e5bc87a291182c78af6ed9ebfdf76883901c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F64 10144 bytes

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