Malicious PDF — malware analysis report

Static analysis result for SHA-256 03fb51dadea44f85…

MALICIOUS

PDF

47.4 KB Created: 2020-08-13 01:17:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bb0dd950e3932df559dd0d3f5f7e318a SHA-1: e2b8311b25867107b32cd75154771f1f8e021530 SHA-256: 03fb51dadea44f8507e23ac512fe7dfcb80207256edbc0fba7a6c303d216b0f5
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one identified as a malicious redirector. The document body, though heavily obfuscated, contains text suggesting it is a 'business english pdf textbook' and includes the malicious URL. The presence of a mass external PDF link farm further indicates a malicious intent to distribute or redirect users. No scripts were extracted, but the PDF structure and link farm are strong indicators of a phishing or redirection attack.

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.cc/pify?keyword=business+english+pdf+textbook
    • http://files.carlalbertbaseball.net/uploads/1/3/2/6/132681482/dudosiwaforojaw.pdf
    • http://files.613studentrentals.com/uploads/1/3/1/4/131437464/2654369.pdf
    • http://files.urbanwordcollective.co.uk/uploads/1/3/0/7/130740130/2612033.pdf
    • http://files.karaikudivoyage.us/uploads/1/3/1/3/131381374/8942354.pdf
    • http://files.mvireland.org/uploads/1/3/1/6/131637953/091222969d41.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/9765/3397/files/discord_markdown_syntax.pdf
    • https://cdn.shopify.com/s/files/1/0430/0757/4179/files/vonikagiwipuba.pdf
    • https://cdn.shopify.com/s/files/1/0452/1459/7271/files/cable_voltage_drop_table.pdf
    • https://cdn.shopify.com/s/files/1/0431/8176/8864/files/english_grammar_rules_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0429/6622/0956/files/5109773877.pdf
    • https://cdn.shopify.com/s/files/1/0438/4263/3890/files/lozukesidenavu.pdf
    • https://cdn.shopify.com/s/files/1/0432/6283/6891/files/kasopatilidixukinido.pdf
    • https://cdn.shopify.com/s/files/1/0437/8099/7269/files/82867752697.pdf
    • https://cdn.shopify.com/s/files/1/0431/0332/2269/files/vba_excel_email.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/71860998709.pdf
    • https://cdn.shopify.com/s/files/1/0435/6079/6318/files/arabic_ocr_to_word_online.pdf
    • https://cdn.shopify.com/s/files/1/0431/6993/9612/files/91197962470.pdf
    • https://cdn.shopify.com/s/files/1/0435/6145/1681/files/gamoredejal.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006f97.bin
d104e8c64e5992a67d08ed1fe1317fd02c13bf7f65f1aa4ade335b14a72e2051		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F97 5320 bytes
font_01_sfnt_off000081a3.bin
53e99191ff83c3f1e7c9c50045d9a8dc0e68c3bec438a00c430173433c656c0b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x81A3 14952 bytes

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