Malicious PDF — malware analysis report

Static analysis result for SHA-256 16b9f99ba125374a…

MALICIOUS

PDF

51.7 KB Created: 2020-08-10 07:20:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e366902a308b4da4dbc6e1a23d44560a SHA-1: 74408d9f76aa305b69f599aed98ed284c70eaddf SHA-256: 16b9f99ba125374a50f3a916e79a2298a2065394ca5842df20a6694541041690
154 Risk Score

Malware Insights

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

The PDF contains numerous links, including one to a known malicious redirector, disguised as an IELTS answer sheet. The ML classifier strongly indicates maliciousness. While no scripts were directly extracted, the PDF structure and embedded links suggest an attempt to redirect users to malicious infrastructure for further exploitation.

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=ielts+listening+test+answer+sheet+pdf
    • http://files.mobileonegaming.com/uploads/1/3/0/7/130738710/24911e10608035.pdf
    • http://files.faithandfriendsinc.org/uploads/1/3/2/6/132696122/7582218.pdf
    • http://files.mattawanmasons.org/uploads/1/3/1/6/131606396/fikedekebozoxuvu.pdf
    • http://files.ethelbustamante.net/uploads/1/3/0/7/130775402/benuverafimapinomax.pdf
    • http://files.artisanteahut.com/uploads/1/3/0/8/130874110/penesuvuwesatof_pudimepuxodi_xawatokuz.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0432/4327/4402/files/rains_of_castamere_instrumental.pdf
    • https://cdn.shopify.com/s/files/1/0451/7065/5381/files/allan_kardec.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/26450283228.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/dipudakafadaned.pdf
    • https://cdn.shopify.com/s/files/1/0430/0144/6554/files/vovobunugatalixak.pdf
    • https://cdn.shopify.com/s/files/1/0437/2329/2822/files/penyakit_orchitis.pdf
    • https://cdn.shopify.com/s/files/1/0434/6213/1869/files/8929260213.pdf
    • https://cdn.shopify.com/s/files/1/0430/5335/1066/files/zoloto_ball_valve_price_list_2020.pdf
    • https://cdn.shopify.com/s/files/1/0433/1329/9620/files/xofefubusu.pdf
    • https://cdn.shopify.com/s/files/1/0435/0902/2886/files/50073096128.pdf
    • https://cdn.shopify.com/s/files/1/0431/8419/3697/files/23152497505.pdf
    • https://cdn.shopify.com/s/files/1/0432/1512/6692/files/12947259900.pdf
    • https://cdn.shopify.com/s/files/1/0429/0949/9551/files/46480942652.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_off00007ec6.bin
002310ca18007609f5c45ebfe0ad0202663bfd9da69b3e79b381a464149ffd13		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7EC6 5008 bytes
font_01_sfnt_off00008fc8.bin
9ae18951823c19ea2b280beadbb9e4c67fb1acac66afbe7e49d22a567e6931d8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8FC8 10468 bytes
font_02_sfnt_off0000b345.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB345 4324 bytes

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