Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c2ad7717d214f8c…

MALICIOUS

PDF

63.2 KB Created: 2020-08-01 22:52:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b68365f7fda7591cc86dda43865276c5 SHA-1: 44cde18b3bb6f50c95ce64e191dc42dc6b63ca81 SHA-256: 5c2ad7717d214f8cbcb2e4dc46c331ab5fde67988cae5846bb9877c13064cf56
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, with one identified as a malicious redirector. The ML classifier also flagged this PDF as malicious. The primary function appears to be a link farm, likely intended to distribute malicious content or manipulate search results.

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=d%2526+d+5e+player%2527+s+manual+pdf
    • http://files.zhuangguo94.com/uploads/1/3/1/6/131637372/2998644.pdf
    • http://files.midwesternsales.com/uploads/1/3/2/6/132681690/7467663.pdf
    • http://files.floridasnowicecream.com/uploads/1/3/0/9/130969915/7197000.pdf
    • http://files.u-surge.net/uploads/1/3/1/4/131438477/tojud.pdf
    • http://files.suemurrayphotographer.com/uploads/1/3/1/4/131437493/588f8.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0429/3532/0742/files/for_loop_bash.pdf
    • https://cdn.shopify.com/s/files/1/0428/9013/3663/files/bhagavad_gita_in_tamil.pdf
    • https://cdn.shopify.com/s/files/1/0436/9124/5733/files/26099427985.pdf
    • https://cdn.shopify.com/s/files/1/0434/2674/2421/files/mavovekude.pdf
    • https://cdn.shopify.com/s/files/1/0437/8053/8529/files/33955461468.pdf
    • https://cdn.shopify.com/s/files/1/0433/7437/9157/files/77261936266.pdf
    • https://cdn.shopify.com/s/files/1/0429/0487/9271/files/8307522087.pdf
    • https://cdn.shopify.com/s/files/1/0430/6799/8362/files/zopoguju.pdf
    • https://cdn.shopify.com/s/files/1/0430/7140/6234/files/68045087833.pdf
    • https://cdn.shopify.com/s/files/1/0434/9159/0308/files/16948053991.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_off00006ade.bin
10b1e8ca5c1ffd40509c37c8d23269801adcfe34a1607cb54df6c3846a3e687a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6ADE 3484 bytes
font_01_sfnt_off0000764b.bin
ab10facde3958e7c8e105c31c8604b6b5df98724ffaccb5d3f62a2c3e5dacbeb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x764B 37804 bytes
font_02_sfnt_off0000c6d0.bin
3b484f5cf6fd6ca9e550f03063d71c7d114d0c0a88c46382159de7758c329453		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC6D0 17784 bytes
font_03_sfnt_off0000e1fc.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE1FC 4324 bytes

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