Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e2607d03e11c50e…

MALICIOUS

PDF

42.7 KB Created: 2020-09-01 02:05:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d9f556d28bc3064c4d0378f88ad79a0b SHA-1: c5ed03190ea06d6ff576eabf80d3a9792b0e8dcf SHA-256: 1e2607d03e11c50ea7f39254a25b29b6dd7dc28b42def22a59a047b723fcce1f
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'ttraff.com'. The document body, though heavily obfuscated, also contains this URL, suggesting it's the primary lure. The presence of numerous other PDF links, many hosted on 'static.usrfiles.com', indicates a link farm strategy. The ML classifier strongly supports the malicious nature of this PDF.

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.com/wix?keyword=aeromexico+argentina+formas+de+pago
    • https://static.usrfiles.com/ugd/b972d5_e711b16dcd1c44469f98227fe3a4c2c0.pdf
    • https://static.usrfiles.com/ugd/ea2f88_58d93ed7aec8465cbde984e26289f660.pdf
    • https://static.usrfiles.com/ugd/b8c837_9c5f3da769b44a55b7a000acd9b8f06c.pdf
    • https://static.usrfiles.com/ugd/784815_9a63d65b8a92493fa32af200162e179a.pdf
    • https://cdn.shopify.com/s/files/1/0430/9935/7338/files/bsc_nursing_2nd_year_syllabus_ruhs.pdf
    • https://cdn.shopify.com/s/files/1/0438/0898/1153/files/evaluation_reporting_system_regulation.pdf
    • https://cdn.shopify.com/s/files/1/0440/1207/7206/files/72947568626.pdf
    • https://cdn.shopify.com/s/files/1/0438/5452/8677/files/benim_hocam_tarih_konu_anlatm.pdf
    • https://static.usrfiles.com/ugd/a1fb72_d9a2a15580cf4e6fad3c03110023e91e.pdf
    • https://static.usrfiles.com/ugd/d9d1f5_9ed063eefe864d56bc285c922921d6b2.pdf
    • https://static.usrfiles.com/ugd/e7e4a0_8fe3df2b41524c1b99a92a485353ac54.pdf
    • https://static.usrfiles.com/ugd/b0b521_e7bf5e6950444354af734b89c4fdaf55.pdf
    • https://static.usrfiles.com/ugd/cafc24_ca80012e94f449139361082fba7b75a8.pdf
    • https://static.usrfiles.com/ugd/affb4a_4c5de09c581f42d3af1346bcc2979927.pdf
    • https://static.usrfiles.com/ugd/b8c837_f607206a59424d43b1c4598ecc782dd2.pdf
    • https://static.usrfiles.com/ugd/238140_ea0bc31f1ae144268f44675d1234b8eb.pdf
    • https://static.usrfiles.com/ugd/b8c837_544ae77e816c44e1973680b0bd586a8c.pdf
    • https://static.usrfiles.com/ugd/b52961_62ea101075a748ea9d410b3ef1fe015d.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000063b2.bin
727cc128eca02ccab2cb615bba4c5be5ab314eb609cb3949820ba7da7d9cdd6f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x63B2 5500 bytes
font_01_sfnt_off0000765a.bin
521b71f860c306ad4a513e2a0c31428fc4e8bca0768f1d35291780c6e5b5f9e6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x765A 11820 bytes

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