Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c79d57e6f46a3a7…

MALICIOUS

PDF

41.0 KB Created: 2020-08-31 15:13:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0a1cb2c055da998dc37c9b8b0724ae0f SHA-1: ee0b5e74e196e744ad336fd2013fae8cad87d5eb SHA-256: 5c79d57e6f46a3a7f14482dff15da2f8c0eb09d5972bfdb218470c43f0b8aa95
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded links, with one pointing to a known malicious redirector. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' and the presence of numerous other links suggest an attempt to drive traffic to malicious infrastructure, possibly for SEO spam or to host phishing content. The ML classifier also strongly indicated maliciousness.

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/wix?keyword=free+naughty+letter+from+santa+template
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/0508/2776/files/60983253703.pdf
    • https://cdn.shopify.com/s/files/1/0429/4790/3644/files/books_for_computer_science_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0427/4293/9814/files/liberalization_and_globalization.pdf
    • https://cdn.shopify.com/s/files/1/0429/9866/1279/files/sawibusegetosomizeja.pdf
    • https://cdn.shopify.com/s/files/1/0433/9289/3093/files/58057320469.pdf
    • https://cdn.shopify.com/s/files/1/0436/4405/9806/files/vugowijuketov.pdf
    • https://cdn.shopify.com/s/files/1/0439/0571/2296/files/rujogilol.pdf
    • https://cdn.shopify.com/s/files/1/0437/6556/3541/files/letter_d_worksheets_for_kindergarten_pdf.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/53059057271.pdf
    • https://cdn.shopify.com/s/files/1/0430/7537/1162/files/startup_company_save_game.pdf
    • https://static.usrfiles.com/ugd/87a178_672cf5ec3e99402ca8aafe6ff3c24a44.pdf
    • https://static.usrfiles.com/ugd/e23fbb_4dd28356ca894e01a96b7f2f5ef509f8.pdf
    • https://static.usrfiles.com/ugd/3ceeb9_84bb6d6ac75a4e3cb9cf8f6bc9c3b770.pdf
    • https://static.usrfiles.com/ugd/b3bc21_5fba19e5bf4c4c1bb4883f8aef6b09fc.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_off00006289.bin
4895b192d660c534224858d1b333d0ddc10e760d662ae856d25a2869a85b1e85
pdf-font-stream PDF embedded font (sfnt) at offset 0x6289 5372 bytes
font_01_sfnt_off000074b9.bin
88bbb6c8afba36b7f0079b824f851f2dbc86a4cf5fae31ef49668592c90ef60e
pdf-font-stream PDF embedded font (sfnt) at offset 0x74B9 10148 bytes