Malicious PDF — malware analysis report

Static analysis result for SHA-256 660b50941e9b6dc9…

MALICIOUS

PDF

49.3 KB Created: 2020-08-08 01:02:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0589bb995c52d4490b0fbdc10939b2b9 SHA-1: 7d13e4e7b6bef59168ad1e1e9e750e677dc248d9 SHA-256: 660b50941e9b6dc9d2677d410c4666551426863444e3037fbd2f0f000667478a
154 Risk Score

Malware Insights

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

This PDF document contains a large number of embedded links, many of which point to external PDF files hosted on various domains, including a known malicious redirector. The document body text, though heavily obfuscated, contains the URL 'https://ttraff.ru/pify?keyword=chronicling+california+pdf', indicating a lure to a malicious site. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is designed to redirect users to harmful content.

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=chronicling+california+pdf
    • http://files.essenceofbeautydublin.com/uploads/1/3/1/6/131637057/9362341.pdf
    • http://zonoj.acthighlanddancing.com/uploads/1/3/0/8/130814297/6698aa63a8.pdf
    • http://files.finalfinishdetailing.com/uploads/1/3/2/7/132710655/levin_linebedanelu_vidaki_vukadidi.pdf
    • http://fonamaf.neoleafpress.com/uploads/1/3/1/0/131070420/339399.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0439/2986/2312/files/5128719868.pdf
    • https://cdn.shopify.com/s/files/1/0438/0144/4514/files/giladigugipuwiwonesovi.pdf
    • https://cdn.shopify.com/s/files/1/0437/1503/5290/files/46re_transmission_rebuild_manual.pdf
    • https://cdn.shopify.com/s/files/1/0436/0876/8675/files/reniseferobutarovusuwana.pdf
    • https://cdn.shopify.com/s/files/1/0428/9986/5756/files/concepto_de_contrato_de_franquicia.pdf
    • https://cdn.shopify.com/s/files/1/0429/2762/0249/files/92223611843.pdf
    • https://cdn.shopify.com/s/files/1/0431/6761/3087/files/kayarian_ng_pang_uri_worksheets.pdf
    • https://cdn.shopify.com/s/files/1/0432/6958/7104/files/interview_questions_and_answers_for_project_managers.pdf
    • https://cdn.shopify.com/s/files/1/0435/0961/2712/files/cdma_2020_architecture.pdf
    • https://cdn.shopify.com/s/files/1/0434/6108/3301/files/fojezube.pdf
    • https://cdn.shopify.com/s/files/1/0430/5872/5018/files/bateberi.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000777c.bin
0298798ca59ebdb057052983c25b0a2cbdc818f295975f2077a2ea57b627cbe6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x777C 4852 bytes
font_01_sfnt_off000087e6.bin
fe9754308c1639aa05a58e0326d50646925a4418b79cfe9e38d7239029308116		 pdf-font-stream PDF embedded font (sfnt) at offset 0x87E6 10076 bytes
font_02_sfnt_off0000aa5b.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAA5B 4324 bytes

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