Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f36c6aed396f51d…

MALICIOUS

PDF

72.6 KB Created: 2020-09-01 08:02:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ee87ddf01ea5f9a22d0fb1916c8c73dc SHA-1: 7f34117f52f1bb857cd51e3048ee94122786937b SHA-256: 5f36c6aed396f51d467fbd5d2061c6fed5f9c28fbe43a5d17af76d43efdedeb3
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure, specifically 'https://ttraff.cc/wix?keyword=formation+assistant+dentaire+pole+emploi+nancy'. This URL is presented within the document body, suggesting a lure to trick users into clicking it. The presence of a large number of external PDF links also indicates a link farm, likely for SEO manipulation or to obscure the malicious redirector. The ML classifier strongly supports the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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=formation+assistant+dentaire+pole+emploi+nancy
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://static.usrfiles.com/ugd/be19e1_9092156f09dd431f99343df23a085581.pdf
    • https://static.usrfiles.com/ugd/9ec29b_34b721df36494a13ab4901f685195cfb.pdf
    • https://static.usrfiles.com/ugd/b8c837_99fad0fd65e749edbd69c1ff0b3a1c86.pdf
    • https://static.usrfiles.com/ugd/b8c837_ecc3a0f0f1b84a7a89b386ec73cec566.pdf
    • https://static.usrfiles.com/ugd/b8c837_f1fb51ce81404a3294fb1828f2d667ca.pdf
    • https://static.usrfiles.com/ugd/b8c837_350d0a29eb0c4a69bdebba7ef5a12e24.pdf
    • https://static.usrfiles.com/ugd/b8c837_9010707b508d4fe29e5c843adfd177c3.pdf
    • https://static.usrfiles.com/ugd/bae363_b7eb5898c47b4e8a832b632fca5769a8.pdf
    • https://static.usrfiles.com/ugd/09273f_d0074267361b4634a8f03c72e8783340.pdf
    • https://static.usrfiles.com/ugd/0c4177_104da242e50042978c3d0059394a9a51.pdf
    • https://static.usrfiles.com/ugd/a467d2_f6038d979774407f9b645252148b1e9d.pdf
    • https://static.usrfiles.com/ugd/b8c837_9a487ad2d96e4df2949d3a1a9a78f803.pdf
    • https://cdn.shopify.com/s/files/1/0436/8223/4521/files/vukifigupidav.pdf
    • https://cdn.shopify.com/s/files/1/0432/5729/9099/files/ffxiv_banned_for_buying_gil_2018.pdf
    • https://cdn.shopify.com/s/files/1/0436/5529/9237/files/anorexia_restrictiva.pdf
    • https://cdn.shopify.com/s/files/1/0434/1350/4150/files/13587150985.pdf
    • https://cdn.shopify.com/s/files/1/0428/1804/4070/files/40730427381.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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00009a4d.bin
158e5751c1365f0968eb50c78874601d084df968a0926528f8b1a8b6569eead8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9A4D 2988 bytes
font_01_sfnt_off0000a4fd.bin
dc9c7c8b280a84b9c766cc67288c234e70fe5907dc4a30d4dd3edc9b140827a9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA4FD 5064 bytes
font_02_sfnt_off0000b611.bin
e6550ee734845d35180df21032b9f69a5e0a1224e0132e83b766e17bc8275b60		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB611 1752 bytes
font_03_sfnt_off0000bebc.bin
63e011d97f62f9e73d9b96bf182aa0481a1667161e6ee04b3a05034f6efb4647		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBEBC 16600 bytes
font_04_sfnt_off0000f0b6.bin
bc1c1644e30597ae0beaac312b9749a82b64e26c109397326cdc67fdbaf2fe17		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF0B6 16036 bytes
font_05_sfnt_off0001051d.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1051D 4324 bytes

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