Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f190ec4db9a4561…

MALICIOUS

PDF

45.9 KB Created: 2020-07-16 02:24:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 988edef23a57c2ad721a77b729e6ee1a SHA-1: 1aa3b614a42295051606428c67bd6d8af863c58e SHA-256: 6f190ec4db9a456110a7eaae52beebf47ef67ead0f88f7c8169c0909c1f92af6
154 Risk Score

Malware Insights

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

The PDF contains numerous links to external resources, masquerading as a document about 'Chilo sacchariphagus'. One of these links, 'https://ttraff.ru/wb?keyword=chilo%20sacchariphagus%20pdf', points to known malicious redirector infrastructure. The ML classifier also strongly indicated maliciousness, suggesting the document is designed to redirect users to harmful sites.

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/wb?keyword=chilo%20sacchariphagus%20pdf
    • http://files.sugarbakeshopperi.com/uploads/1/3/1/4/131414516/9218830.pdf
    • http://files.mrmaglocci.com/uploads/1/3/0/7/130776167/maguv-lalovuzig.pdf
    • http://files.uclaadx.org/uploads/1/3/0/7/130776682/lukimap-viwek-widenatulos-xepuvi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://gubakuv.files.wordpress.com/2020/07/fewosigotutiwofutotenelis.pdf
    • https://vupexife.files.wordpress.com/2020/07/jilugewupunefukuka.pdf
    • https://zileweke.files.wordpress.com/2020/06/tuguluvewif.pdf
    • https://vonadezosul499015480.files.wordpress.com/2020/07/54280721994.pdf
    • https://lituwinav.files.wordpress.com/2020/07/devawijogopu.pdf
    • https://robesezidir.files.wordpress.com/2020/06/dufakiwin.pdf
    • https://binobubobon.files.wordpress.com/2020/07/wuwefovidodas.pdf
    • https://bugigos.files.wordpress.com/2020/06/44728078171.pdf
    • https://cdn.shopify.com/s/files/1/0429/8578/3447/files/24509693880.pdf
    • https://cdn.shopify.com/s/files/1/0430/9381/9541/files/50698791526.pdf
    • https://cdn.shopify.com/s/files/1/0431/3117/5063/files/46444956866.pdf
    • https://cdn.shopify.com/s/files/1/0430/4296/3613/files/66093592255.pdf
    • https://cdn.shopify.com/s/files/1/0432/3147/7922/files/43943965177.pdf
    • https://cdn.shopify.com/s/files/1/0428/1958/4166/files/tovexapef.pdf
    • https://cdn.shopify.com/s/files/1/0430/1455/3763/files/35235497445.pdf
    • https://cdn.shopify.com/s/files/1/0429/2247/5687/files/81214457030.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/49186839350.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_off000074df.bin
4cfb1c6d8523104b2b2fe322d6e5ca36438c1f987d4045c1e7bcb1b1a4298917		 pdf-font-stream PDF embedded font (sfnt) at offset 0x74DF 5020 bytes
font_01_sfnt_off000085fb.bin
1a2d42b4be470c054399e8e9c9a4ebbac077495df168b958cb7b2d278324219e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x85FB 10564 bytes

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