Malicious PDF — malware analysis report

Static analysis result for SHA-256 653ef3f7160b212b…

MALICIOUS

PDF

32.3 KB Created: 2020-11-04 16:04:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 897f92e5812881a328d498ee49fb3620 SHA-1: 753928620aba6cf0b256b3e96750f0adb730a2d3 SHA-256: 653ef3f7160b212be8bae71e889316cb4b51de5b9cffce0018e9df48b77b34ce
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, with one specifically identified as a malicious redirector. The document body, though heavily obfuscated, contains references to URLs that appear to be part of a link farm designed to distribute traffic to potentially malicious sites. The ML classifier also strongly indicated maliciousness.

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://cctraff.ru/123?keyword=understanding+nutrition+13th+edition+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4406169/normal_5f948a8f44b45.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445129/normal_5fa0b4ef61a3f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393348/normal_5f9080ef3b6d5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460686/normal_5fa1de8425b2b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367927/normal_5f875c6449dc7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423757/normal_5f9cad54d040d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370780/normal_5f8a3f4243c64.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413113/normal_5f9422d284357.pdfIn PDF document text
    • https://gaxowewogilul.weebly.com/uploads/1/3/4/4/134401205/pisabokisopoz.pdfIn PDF document text
    • https://gaxopekel.weebly.com/uploads/1/3/0/9/130969853/durilozedesulogimi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378171/normal_5f9b90444ca2e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/paxivogedewilu/radio_merit_badge_worksheet_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/tesotiwapax/sapijis.pdfIn PDF document text
    • https://s3.amazonaws.com/vunizi/ntn_bearing_catalogue_download.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000041b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x41B6 5480 bytes
SHA-256: 47acc3f4085bd037e7a21f1b4752bb554f075f2aaa9a97af61ebb0f20bd5d7e2
font_01_sfnt_off0000545e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x545E 9352 bytes
SHA-256: 7938a5c43dadb3ebd4770f85f3bdc200165113bc2552240e8e836bd2963d7ae3

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