Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b2e607fdcd01276…

MALICIOUS

PDF

48.5 KB Created: 2020-11-03 06:16:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: c295fdfa5a5b13fe7e1ba4d4060a941b SHA-1: d58151defd618f8871fdf53ed1998c7d717022f9 SHA-256: 7b2e607fdcd01276c515dea88d16477bfeea43ad5580554cb3214a530c8bcee0
154 Risk Score

Malware Insights

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

The PDF contains a link farm and a critical redirector link pointing to 'https://gettraff.ru/strik?keyword=video+edit+apps+pc', which is known malicious infrastructure. The document body, though heavily obfuscated, also contains this URL, suggesting an attempt to lure users to a malicious site. The presence of numerous PDF links and the ML classifier output further support its malicious nature.

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://gettraff.ru/strik?keyword=video+edit+apps+pc In PDF document text
    • https://bedizegoresupa.weebly.com/uploads/1/3/1/3/131379398/kezupukono.pdfIn PDF document text
    • https://xukanimuwuvam.weebly.com/uploads/1/3/2/6/132696198/9d53d4050b193.pdfIn PDF document text
    • https://mumixopid.weebly.com/uploads/1/3/1/8/131872042/fujepidutagimikon.pdfIn PDF document text
    • https://dewubonate.weebly.com/uploads/1/3/4/4/134466502/40fc674.pdfIn PDF document text
    • https://nipaxibovaj.weebly.com/uploads/1/3/1/3/131379211/ribiwenowurakenozaf.pdfIn PDF document text
    • https://lifagixuwemup.weebly.com/uploads/1/3/0/9/130969738/nareselij.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/pisik/introduction_to_christian_theology.pdfIn PDF document text
    • https://s3.amazonaws.com/lixasifasi/easy_algebra_word_problems.pdfIn PDF document text
    • https://s3.amazonaws.com/padadutiseni/assignment_abroad_times_epaper_today_2019_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_off00008012.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8012 4904 bytes
SHA-256: 06d89a6ebb0b29e5aee39e9060392620847fd1ae229bf8c85ef7bd54785e90be
font_01_sfnt_off000090d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x90D8 10896 bytes
SHA-256: e0cb0065ddadc6e9e78a631a9a67204dd16d5cfbfa6284cb862d80c20d17c3e5

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