Malicious PDF — malware analysis report

Static analysis result for SHA-256 f64ea213706ada5d…

MALICIOUS

PDF

70.8 KB Created: 2020-08-29 21:51:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: da3a373dbd981381e19a0dea65133ac8 SHA-1: 4fb88f19ae12db2eb437ed686981dc63ce87a171 SHA-256: f64ea213706ada5d98cd081a7ea0dca8690b6b2cac257e9441bedc9d3b8a1a57
152 Risk Score

Malware Insights

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

The PDF document was flagged by multiple critical heuristics for containing a malicious redirector link and a link farm. The ML classifier also strongly indicated maliciousness. The primary malicious IOC is the redirector URL, which is likely used to lure users to a compromised or malicious site. No scripts were extracted, and the document body was unreadable binary data.

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/wix?keyword=%25D9%2585%25D9%2584%25D8%25A7%25D8%25A8%25D8%25B3+%25D9%2587%25D9%2586%25D8%25AF%25D9%258A%25D8%25A9+%25D8%25B9%25D9%2584%25D9%2589+%25D8%25A7%25D9%2584%25D8%25A5%25D9%2586%25D8%25AA%25D8%25B1%25D9%2586%25D8%25AA+%25D8%25AA%25D8%25AA%25D8%25B3%25D9%2588%25D9%2582+%25D9%2584%25D9%2584%25D8%25B1%25D8%25AC%25D8%25A7
    • https://cdn.shopify.com/s/files/1/0438/2910/0701/files/miporilanojo.pdf
    • https://cdn.shopify.com/s/files/1/0431/8121/1810/files/2445146957.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/94662163826.pdf
    • https://cdn.shopify.com/s/files/1/0431/5286/7477/files/audi_a6_c6_repair_manual_download.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/zenafepejeviwasi.pdf
    • https://cdn.shopify.com/s/files/1/0433/7437/9158/files/30760112309.pdf
    • https://cdn.shopify.com/s/files/1/0437/1962/2808/files/lufurow.pdf
    • https://static.usrfiles.com/ugd/fa6f14_d01aec80920e477bb933f8c4879588e3.pdf
    • https://static.usrfiles.com/ugd/b8c837_806dfe3ea78b417c8dfa9f9b6c3a9b6b.pdf
    • https://static.usrfiles.com/ugd/b8c837_440639ac48aa415889b8eed6d5e7fc38.pdf
    • https://static.usrfiles.com/ugd/b8c837_b2221ff361a9486cbb9e7216a1bcb6bd.pdf
    • https://static.usrfiles.com/ugd/3aee12_44fe1032b1824eb78fa46e2d1be21bbc.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off0000d33b.bin
48cf197d9844a69d3af6fb983792f137e7c7ff9bdb9137b3c04b194c1b8c38f0		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0xD33B 31940 bytes
font_00_sfnt_off0000887b.bin
88b4df287869f8a87cfca73fa70e055f9c8c0ff4f418bc447a4fa7089e3d2d74		 pdf-font-stream PDF embedded font (sfnt) at offset 0x887B 4068 bytes
font_01_sfnt_off0000965a.bin
e39a6a535b4c546b12f700c7d294b10f58e9ed25e744c982b618cefda7654c95		 pdf-font-stream PDF embedded font (sfnt) at offset 0x965A 19100 bytes
font_02_sfnt_off0000b527.bin
08d20dcf1e480ed450a96164ff86eca22cbf41772a6dd7a16ca2c004243b83e0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB527 8780 bytes

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