Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d1bf16b923e8c69…

MALICIOUS

PDF

51.7 KB Created: 2020-08-05 23:20:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5c2cfca3e6244bcffb9ea3c6befd23c6 SHA-1: b02bbb4be01e43fdf93b3fe9d52a5889d4330773 SHA-256: 5d1bf16b923e8c69ad2441cd10d36f006f10eb98540767817fe4cb35b2408921
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, with one identified as a malicious redirector. The ML classifier strongly flagged this PDF as malicious, and the presence of a link farm suggests an attempt to manipulate search engine results or distribute malicious content. The document body, though partially corrupted, contains the URL that leads to the malicious redirector.

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.cc/pify?keyword=amplitude+modulation+applications+pdf
    • http://files.htcatholicschoolmyrtlebeach.com/uploads/1/3/1/0/131069781/jeriwepadivebu_momasidaxifizem_pitukikinewu_toluvo.pdf
    • http://banod.dignityshouse.org/uploads/1/3/0/7/130775387/16a87f.pdf
    • http://zanati.spencerclarkphotography.com/uploads/1/3/2/7/132740435/xikoju-zufebovikatena-limelined.pdf
    • http://wijigeji.gpsafety.net/uploads/1/3/2/7/132740836/koxepurig_morujepux_xisajimekena.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/8942/8637/files/calibration_of_weighing_balance.pdf
    • https://cdn.shopify.com/s/files/1/0430/9378/6791/files/5748603874.pdf
    • https://cdn.shopify.com/s/files/1/0436/5107/2158/files/51987809053.pdf
    • https://cdn.shopify.com/s/files/1/0434/6681/7689/files/80526481042.pdf
    • https://cdn.shopify.com/s/files/1/0438/3975/0294/files/bojiba.pdf
    • https://cdn.shopify.com/s/files/1/0430/1992/7713/files/19950977897.pdf
    • https://cdn.shopify.com/s/files/1/0438/1281/5008/files/20486663306.pdf
    • https://cdn.shopify.com/s/files/1/0434/8831/3506/files/35059882997.pdf
    • https://cdn.shopify.com/s/files/1/0432/9200/0406/files/48094551866.pdf
    • https://cdn.shopify.com/s/files/1/0434/3998/0710/files/giresazesipuxometebelukaf.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006d9b.bin
cd15c52a0a412b73cc8beedd1ff51de50cb95f355b5b5b148c24fcdea0865a54		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6D9B 5196 bytes
font_01_sfnt_off00007f31.bin
d915b4c88dfdf60cdb32956bab26f2e5031be282031ae5e7e96d84eb7a97fb75		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7F31 1596 bytes
font_02_sfnt_off00008749.bin
e5e49f191833bc1a214cbb7c0f35a9f504d1ca38956f8d9c0e8ccdcc6a29952e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8749 10432 bytes
font_03_sfnt_off0000aae4.bin
5d8d726b7924626b6582eab718e65b9af01522c6da373b3dbc646370f5c181f4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAAE4 16400 bytes

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