Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ff2be100fef12fd…

MALICIOUS

PDF

45.2 KB Created: 2020-08-21 17:14:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5816cc48bfd7f720448187f8acfc15af SHA-1: 673fa17f861f31883f67faa6d6d2ce0465d70beb SHA-256: 0ff2be100fef12fd44aa6e1876f487e41c12c068488023f75331d1bab398d1b5
154 Risk Score

Malware Insights

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

The PDF contains numerous links, with one specifically pointing to a known malicious redirector. The document body, though heavily obfuscated, contains the URL that leads to the redirector. The presence of a large number of external links suggests a link farm or SEO manipulation tactic, likely to obscure the malicious intent. No scripts were extracted, but the PDF structure itself facilitates the malicious redirection.

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=car+airbag+system+pdf
    • http://files.wolkenfeldhomes.com/uploads/1/3/1/3/131382395/5640305.pdf
    • http://bidawafiw.flockofbirdsmosaics.org/uploads/1/3/2/3/132302751/wedotojagixogidosove.pdf
    • http://gitupow.neeleyhvac.com/uploads/1/3/1/6/131637016/3261172.pdf
    • http://files.bkhouse.services/uploads/1/3/1/8/131856042/6379020.pdf
    • http://files.pemmensgolf.net/uploads/1/3/1/3/131379612/febokibilodirina.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0428/2066/5510/files/andis_blade_chart.pdf
    • https://cdn.shopify.com/s/files/1/0431/7400/2837/files/81169990353.pdf
    • https://cdn.shopify.com/s/files/1/0432/2410/5124/files/sudibibakexutod.pdf
    • https://cdn.shopify.com/s/files/1/0434/6334/4280/files/kavoxepisusosujabikopezir.pdf
    • https://cdn.shopify.com/s/files/1/0429/1588/9305/files/fevogu.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/lozafawofife.pdf
    • https://cdn.shopify.com/s/files/1/0428/5893/8531/files/zulajopidusefojilo.pdf
    • https://cdn.shopify.com/s/files/1/0431/4398/7361/files/69400774247.pdf
    • https://cdn.shopify.com/s/files/1/0437/0923/5355/files/voxujawiza.pdf
    • https://cdn.shopify.com/s/files/1/0439/6479/2990/files/76834099238.pdf
    • https://cdn.shopify.com/s/files/1/0437/4836/0343/files/free_addition_practice_worksheets_for_kindergarten.pdf
    • https://cdn.shopify.com/s/files/1/0430/5331/8298/files/54789069847.pdf
    • https://cdn.shopify.com/s/files/1/0434/1720/6949/files/luranigaperamusizedubo.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_off000065cf.bin
37e253b7bacf4d87bfadf27a616eba1069d9628bc3e92d0d0bb88e11515b4f12		 pdf-font-stream PDF embedded font (sfnt) at offset 0x65CF 5168 bytes
font_01_sfnt_off0000776c.bin
da31a17c26b0b5de37d7d3e8e09ab5c47ba5c0264edf6715c273bfb6a5d45295		 pdf-font-stream PDF embedded font (sfnt) at offset 0x776C 10080 bytes
font_02_sfnt_off000099e2.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x99E2 4324 bytes

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