Malicious PDF — malware analysis report

Static analysis result for SHA-256 01d0039bedf43586…

MALICIOUS

PDF

44.3 KB Created: 2020-08-15 14:39:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 989c2f23547965a4eea2ece659ca31d4 SHA-1: ed53139c4e5a96213dbafdf62dbab709d4a7c14e SHA-256: 01d0039bedf43586fa37beea1b02bc66e68d5d3a995438b9ab5a68035aa44613
162 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure. The document body also contains a link to this redirector, and numerous other links to PDF files hosted on various domains, some of which are flagged as unknown. The presence of a 'download button' heuristic further suggests a malicious workflow. While no scripts were extracted, the overall structure and URL findings point to a phishing or redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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.com/pify?keyword=brandon+grotesque+light+font
    • http://files.tensilegroupinc.com/uploads/1/3/0/8/130814475/xabuvulutulonal.pdf
    • http://files.herbssupply.com/uploads/1/3/0/7/130775200/mekivukopatar-sazufexi-rewarofubup.pdf
    • http://subunoj.thebedrestbookclub.com/uploads/1/3/1/3/131381886/sirenetusenep.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/8125/3535/files/42199940609.pdf
    • https://cdn.shopify.com/s/files/1/0427/6633/6167/files/52968695637.pdf
    • https://cdn.shopify.com/s/files/1/0432/4157/0466/files/chef_s_choice_110_user_manual.pdf
    • https://cdn.shopify.com/s/files/1/0430/8303/8874/files/46021195521.pdf
    • https://cdn.shopify.com/s/files/1/0432/7417/4632/files/nicomachean_ethics_sparknotes.pdf
    • https://cdn.shopify.com/s/files/1/0433/4272/5275/files/gewemekawemabulafidito.pdf
    • https://cdn.shopify.com/s/files/1/0434/6272/1688/files/arguably_by_christopher_hitchens.pdf
    • https://cdn.shopify.com/s/files/1/0435/7206/8520/files/jovajesirotanimokodipe.pdf
    • https://cdn.shopify.com/s/files/1/0428/0310/1863/files/72925412454.pdf
    • https://cdn.shopify.com/s/files/1/0430/2402/3715/files/6675558165.pdf
    • https://cdn.shopify.com/s/files/1/0438/6720/9893/files/saying_numbers_in_english_exercises.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005996.bin
ab740300fcfe08b5973e178abca46a266c506d1e496a9742a935a823e9e14582		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5996 5344 bytes
font_01_sfnt_off00006bad.bin
747bba4c70eba1fc084472897c6f873f009feba95f4161022d691e0421f37c37		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6BAD 10424 bytes
font_02_sfnt_off00008f67.bin
ce90dcb8f80a691a226d66d7b9fb40db13b52946125f6d312f8860abae454107		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8F67 16084 bytes

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