Malicious PDF — malware analysis report

Static analysis result for SHA-256 133bed6a4e844a52…

MALICIOUS

PDF

45.5 KB Created: 2020-08-31 22:32:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 10bffc16f646ee84c52a778114a3e0cb SHA-1: c186ab38b51e8872871cb8f1e50f665f6f9759e1 SHA-256: 133bed6a4e844a5216bd3dce43c6f170a2d2e56838e512c24fb95d3f29a3541c
154 Risk Score

Malware Insights

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

The PDF contains a link to a redirector URL, identified as malicious. It also hosts a large number of external PDF links, many of which are benign but serve to obscure the malicious intent. The ML classifier strongly indicates maliciousness. The embedded URL and the PDF link farm heuristics suggest a social engineering attempt to redirect users to malicious content.

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/wix?keyword=whatsapp+status++best+romantic+song
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fedorahosted.org/lohit
    • https://cdn.shopify.com/s/files/1/0432/5461/2123/files/ludotukevizekizenewafawiz.pdf
    • https://cdn.shopify.com/s/files/1/0430/4610/9341/files/kolenudawovekapugajowo.pdf
    • https://cdn.shopify.com/s/files/1/0436/0817/8845/files/female_body_anatomy_pictures.pdf
    • https://cdn.shopify.com/s/files/1/0428/0470/7491/files/gijuxejinobaduruneb.pdf
    • https://cdn.shopify.com/s/files/1/0431/6649/8965/files/jeterufuwakojaxolutilaj.pdf
    • https://cdn.shopify.com/s/files/1/0439/0499/1400/files/game_of_thrones_cello_solo_sheet_music.pdf
    • https://cdn.shopify.com/s/files/1/0427/8150/7740/files/wazetati.pdf
    • https://cdn.shopify.com/s/files/1/0432/7342/0965/files/9303649740.pdf
    • https://cdn.shopify.com/s/files/1/0437/1637/8773/files/91983440071.pdf
    • https://cdn.shopify.com/s/files/1/0427/5830/8006/files/mokopawutewanif.pdf
    • https://cdn.shopify.com/s/files/1/0429/3551/7337/files/4595227890.pdf
    • https://static.usrfiles.com/ugd/b8c837_e8583b214ffa40809a142a7795c9f486.pdf
    • https://static.usrfiles.com/ugd/b8c837_d98ecf1e30fa40c4a7234ac87a46b2e5.pdf
    • https://static.usrfiles.com/ugd/b8c837_d411eca74660407d873d09231a012fef.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_off00005e07.bin
3e47bd5393b147bc1b0f96546f696eaed8818455700c4008219f85e32ca2ef10		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5E07 5468 bytes
font_01_sfnt_off0000707e.bin
4c9ff3338a44e1d973beff9d2381e2c41ef685f24a8e5eaccb5fc6020fbabd18		 pdf-font-stream PDF embedded font (sfnt) at offset 0x707E 9668 bytes
font_02_sfnt_off000091cb.bin
c74c34590ef42140a1326a37604962ad639edb339021220e15059f64966cf36f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x91CB 6664 bytes

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