Malicious PDF — malware analysis report

Static analysis result for SHA-256 689a369ef9782daa…

MALICIOUS

PDF

40.3 KB Created: 2020-08-08 00:09:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a6cbea8cbfdff3a75bae88178ae0a285 SHA-1: 6b7456cf0d43952f22a0265ce3d575a5c65e76fb SHA-256: 689a369ef9782daa4d0b5516c69b629ac1146942a8b62b5b66e89ff3a9a29133
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded links, characteristic of a link farm designed to artificially boost search engine rankings or distribute malicious content. One of the links, 'https://ttraff.com/pify?keyword=assessment+in+special+needs+education+pdf', is identified as a known malicious redirector, indicating a phishing or malware distribution attempt. The ML classifier also strongly flagged this PDF as malicious.

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.com/pify?keyword=assessment+in+special+needs+education+pdf
    • http://wutavapo.creativelyyourscustomcakes.com/uploads/1/3/1/3/131379578/wavun.pdf
    • http://files.tripsandtrails.ca/uploads/1/3/2/7/132741241/lizoliwibinumerowubo.pdf
    • http://files.glutenfreeindy.com/uploads/1/3/1/4/131407802/beseso-nediz-bikexalanalezud-xesatilu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/5036/0232/files/honda_magna_v65.pdf
    • https://cdn.shopify.com/s/files/1/0433/8493/0462/files/95086901575.pdf
    • https://cdn.shopify.com/s/files/1/0429/8987/9445/files/80559632581.pdf
    • https://cdn.shopify.com/s/files/1/0430/4666/6389/files/centrifuge_diagram.pdf
    • https://cdn.shopify.com/s/files/1/0438/5318/5174/files/argentometric_method.pdf
    • https://cdn.shopify.com/s/files/1/0435/2717/6344/files/sikozebegojogitexabewidag.pdf
    • https://cdn.shopify.com/s/files/1/0433/4462/5822/files/87500724137.pdf
    • https://cdn.shopify.com/s/files/1/0428/7964/7903/files/watch_twilight_breaking_dawn_part_1.pdf
    • https://cdn.shopify.com/s/files/1/0433/6936/5654/files/birogibinexuxowamejim.pdf
    • https://cdn.shopify.com/s/files/1/0433/4724/7263/files/honeymoon_period_diabetes.pdf
    • https://cdn.shopify.com/s/files/1/0429/8909/3018/files/jefonirapodotogolugit.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005e68.bin
5cd54862fe63d06f2211e2e178a7a0f57bfb1b9b91cd00edb74c734951498339
pdf-font-stream PDF embedded font (sfnt) at offset 0x5E68 5196 bytes
font_01_sfnt_off00007008.bin
4bf0b43549bc4b55b0b9541ad9ca8a536be3c1c077809a9abd6829c68a6c3fbf
pdf-font-stream PDF embedded font (sfnt) at offset 0x7008 10688 bytes