Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f9884b0f81991f1…

MALICIOUS

PDF

53.4 KB Created: 2020-08-17 06:08:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 94469e7335545a2f7ee092920f65f279 SHA-1: e04003053e33123627bad289221c913373659ee5 SHA-256: 7f9884b0f81991f1328724300ed711a230d1cbd213ddb76c7b349cead46ef007
154 Risk Score

Malware Insights

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

The PDF contains a link farm and a redirector URL, indicating an attempt to lead users to malicious content. The ML classifier strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the presence of embedded URLs and the heuristic firings suggest a malicious intent to redirect users to potentially harmful sites, possibly for phishing or malware delivery.

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=solving+rational+expressions+worksheet+with+answers+pdf
    • http://jaxujuv.bluwooddesignandbuild.co.uk/uploads/1/3/1/6/131637254/goduvaj.pdf
    • http://files.d-team.info/uploads/1/3/1/4/131453555/fulivegime_dijonaxaxelela_xidawajola.pdf
    • http://gafozoxi.luebtowj.com/uploads/1/3/1/4/131438641/d8e50d69b98096a.pdf
    • http://riwagin.abbywendy.co.nz/uploads/1/3/0/8/130814297/2711735.pdf
    • http://zuwiwital.piperfayephotography.com/uploads/1/3/2/7/132712093/wekanodu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/6750/6849/files/kipepulimanimabowu.pdf
    • https://cdn.shopify.com/s/files/1/0430/3477/1607/files/56987804185.pdf
    • https://cdn.shopify.com/s/files/1/0438/4571/4077/files/92613949633.pdf
    • https://cdn.shopify.com/s/files/1/0433/2178/6521/files/budoxeliburetizumofewanem.pdf
    • https://cdn.shopify.com/s/files/1/0429/9449/9743/files/geometric_sequence.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/85155057715.pdf
    • https://cdn.shopify.com/s/files/1/0427/7121/8588/files/feledufufigona.pdf
    • https://cdn.shopify.com/s/files/1/0429/6255/0940/files/add_to_kindle_cloud_reader.pdf
    • https://cdn.shopify.com/s/files/1/0428/0611/6511/files/wobul.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000707b.bin
94b1568b0c9153a31468ac226facaa1b5d5684289dfd8e8b3fb25f2aee790fa0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x707B 5688 bytes
font_01_sfnt_off000083e4.bin
805a4e91f9cef380515c3a2a66a19f90f9e50a31e9d233f3b552a6296630b711		 pdf-font-stream PDF embedded font (sfnt) at offset 0x83E4 14660 bytes
font_02_sfnt_off0000b1eb.bin
73e18e1b520c5ef4424bada6fa52b30450462488f402fbcfc6484d4b0fcca15a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB1EB 16272 bytes

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