Malicious PDF — malware analysis report

Static analysis result for SHA-256 12bc36cf3d82e457…

MALICIOUS

PDF

56.8 KB Created: 2020-08-31 17:18:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d96010f477ae133a2d6df229f29c9fd0 SHA-1: 05deeea5bc5ae66e9abc5b9834d73f2474fcfdd4 SHA-256: 12bc36cf3d82e4574018e7b420a87d11f15d08aef2213a51ccdada0ea1773f1d
162 Risk Score

Malware Insights

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

The PDF contains a link to a redirector, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic, which leads to the URL https://ttraff.me/wix?keyword=ignou+date+sheet+2019+bsc. This, combined with the PDF_SEO_LINK_FARM heuristic indicating a large number of external links, suggests a phishing or scam attempt. The ML_NYX_PDF_MALICIOUS classifier strongly supports the malicious verdict.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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.me/wix?keyword=ignou+date+sheet+2019+bsc
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fedorahosted.org/lohit
    • https://static.usrfiles.com/ugd/6cf392_fce46372933e431db07cb6be3f56f5f6.pdf
    • https://static.usrfiles.com/ugd/f09a9d_649982c8e9ec4501b76f5f6d3d7e1d96.pdf
    • https://static.usrfiles.com/ugd/7c3584_cda989f160e94c5698be1ec4eedaf265.pdf
    • https://static.usrfiles.com/ugd/b8c837_5eb25f9902e447c89147184e0b68948f.pdf
    • https://static.usrfiles.com/ugd/b8c837_5219792cea124f4bab4619b3fcd615ba.pdf
    • https://static.usrfiles.com/ugd/e5412a_689d1b578b724b0294023336aefb582f.pdf
    • https://static.usrfiles.com/ugd/bfbc46_5b2f27a45ce943cab0cc6641abb96e51.pdf
    • https://cdn.shopify.com/s/files/1/0430/3667/2162/files/wumen.pdf
    • https://cdn.shopify.com/s/files/1/0437/6713/6413/files/vegose.pdf
    • https://cdn.shopify.com/s/files/1/0431/6758/0322/files/radonitadorupivokija.pdf
    • https://cdn.shopify.com/s/files/1/0435/4034/9082/files/takurelematesuvuwuk.pdf
    • https://cdn.shopify.com/s/files/1/0431/1610/1793/files/food_waste_management_project_report.pdf
    • https://cdn.shopify.com/s/files/1/0429/4089/1292/files/43505804076.pdf
    • https://cdn.shopify.com/s/files/1/0430/3618/0634/files/zeworabapaged.pdf
    • https://cdn.shopify.com/s/files/1/0460/0866/4231/files/applications_of_queueing_theory_newell.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
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNU
    • http://www.gnu.org/copyleft/gpl.htmRegular

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000781a.bin
4a1f28d596f49e910eba66ac23c52efdde58f52dd20a586efcdf49d39d6a5091		 pdf-font-stream PDF embedded font (sfnt) at offset 0x781A 5632 bytes
font_01_sfnt_off00008b36.bin
40ef96da86b6123d577d475be460de15c41b9ca7393a8e650be4e9942aa3c64b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8B36 3720 bytes
font_02_sfnt_off00009698.bin
d61b3632ac957d65b84bfaa257b5cca1d5d27e2b660fb0349b092b0e5558f3c5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9698 10244 bytes
font_03_sfnt_off0000b9a3.bin
e31c3d90812c549fb4c1c8a95bb11414cb56bb729d653e4d2142bb650ccec88b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB9A3 8380 bytes

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