Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecb9e26ff2c9e1e5…

MALICIOUS

PDF

58.9 KB Created: 2020-10-31 03:06:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 34a314685e86ef62a39de819842068ed SHA-1: 881447b069025803e34fced14ed3e6ba575748a7 SHA-256: ecb9e26ff2c9e1e54de42139a8cf00bea408dccf31fc5af909d416e65fd61b31
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with one specifically identified as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains URLs that are likely part of a link farm or redirection scheme designed to lead users to malicious content or exploit kits.

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://ggtraff.ru/aws?keyword=ragnarok+archer+solo+leveling+guide In PDF document text
    • https://letalisukom.weebly.com/uploads/1/3/4/3/134316231/vewunarorajurejo.pdfIn PDF document text
    • https://besiwalufeg.weebly.com/uploads/1/3/2/6/132696214/431108.pdfIn PDF document text
    • https://vifaniju.weebly.com/uploads/1/3/4/5/134507083/12ed4ee9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://cdn.shopify.com/s/files/1/0500/3991/4646/files/paduduzagefoduj.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0500/4414/1731/files/rv_shower_stall_ideas.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0498/7423/9646/files/sawipodepebuk.pdfIn PDF document text
    • https://s3.amazonaws.com/zetare/56604211920.pdfIn PDF document text
    • https://s3.amazonaws.com/sugaguxagu/anemia_perniciosa_diagnstico.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0485/9789/3280/files/brawl_stars_apk_indir_pc.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/3707/2280/files/baby_bjorn_high_chair_weight_limit.pdfIn PDF document text
    • https://s3.amazonaws.com/zidosozawok/cambridge_english_for_engineering_student_s_book_free_download.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/6261/5446/files/27538036335.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000099c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x99C9 5136 bytes
SHA-256: 15555b2142c68ca9b2cd7603dd915861cb25a325500bb7dbf208c5714d52dc83
font_01_sfnt_off0000ab37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAB37 11124 bytes
SHA-256: b2b1bdebef35039ed683ea7faab2b904cd0d852a28a9da241199a6fa048d97c6
font_02_sfnt_off0000d0d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0D8 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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