Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed8b3d0f44ee4309…

MALICIOUS

PDF

38.0 KB Created: 2020-08-03 18:51:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: af9676632f825cbdca7afb017cf36f5a SHA-1: ed8bc929721c68ed4bcd62c9ccdec7fed948aa9b SHA-256: ed8b3d0f44ee430970e5b1ab8485b260066db6f4f2cef80f20a33b234bb531f4
150 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing for a malicious redirector URL. The document body, though heavily obfuscated, contains text that appears to be a timetable and includes the malicious URL. The ML classifier also strongly indicated maliciousness. The primary attack vector appears to be directing users to malicious infrastructure disguised as legitimate content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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/pify?keyword=horaire+ligne+2+alterneo+pdf
    • http://files.asmuyaocommunityschool.com/uploads/1/3/2/7/132740743/324409.pdf
    • http://files.purityconventionalseed.com/uploads/1/3/1/6/131636632/resokizifol_dokiju_mibugeropolezej.pdf
    • http://zabit.fcctboosterclub.com/uploads/1/3/0/8/130814788/gafajizebejep.pdf
    • http://files.cheffreshgrabngo.com/uploads/1/3/1/6/131637147/jilod_nukutagujojoxom_vigosedon_kisadiradake.pdf
    • https://cdn.shopify.com/s/files/1/0434/0521/3854/files/10651033707.pdf
    • https://cdn.shopify.com/s/files/1/0427/9340/2534/files/wobolurowumiku.pdf
    • https://cdn.shopify.com/s/files/1/0433/9014/0581/files/tajupekogek.pdf
    • https://cdn.shopify.com/s/files/1/0431/3510/7233/files/lawezitobeki.pdf
    • https://cdn.shopify.com/s/files/1/0430/5590/6973/files/82476899069.pdf
    • https://cdn.shopify.com/s/files/1/0429/8535/7463/files/59461588918.pdf
    • https://cdn.shopify.com/s/files/1/0433/3935/0181/files/wuxenavodobabobogokeziv.pdf
    • https://cdn.shopify.com/s/files/1/0430/0010/3073/files/11504174686.pdf
    • https://cdn.shopify.com/s/files/1/0440/8731/2534/files/donugojomuwerik.pdf
    • https://cdn.shopify.com/s/files/1/0432/7243/7910/files/wefofegabi.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_off00005421.bin
0c1aec372003000a1df47406ac2ab32d14f75088d1db19a16c37270cc400fe7c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5421 5124 bytes
font_01_sfnt_off000065a0.bin
ee688392fd0f0852c7d7fd8841949d56e99aa45bac6393d3233901b96b854376		 pdf-font-stream PDF embedded font (sfnt) at offset 0x65A0 11496 bytes

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