Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd0e4099b929ee52…

MALICIOUS

PDF

39.2 KB Created: 2020-08-10 05:26:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 27dbf106e9f2555661db54619c720264 SHA-1: 276851a135a95a5a8f5c8dd5d564d2b1470e63d5 SHA-256: dd0e4099b929ee52a0051b418a1c59ebcb54b1de7b8c7ea1d6912bb50c3b2d3b
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, which is also present in the document body. This link, 'https://ttraff.cc/pify?keyword=cengage+mathematics+algebra+pdf+download', is designed to lead users to malicious infrastructure. The document also exhibits characteristics of a link farm, with numerous external PDF links, many hosted on cdn.shopify.com, suggesting an attempt to manipulate search engine results or distribute content. The ML classifier 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.cc/pify?keyword=cengage+mathematics+algebra+pdf+download
    • http://files.martinsvillesoapworks.com/uploads/1/3/0/8/130874457/9668561.pdf
    • http://fimuluk.lexiweege.com/uploads/1/3/2/3/132303382/jubitugalerurolidi.pdf
    • http://misel.losachicboutique.ca/uploads/1/3/1/1/131164250/6a033730.pdf
    • http://files.adorelittlechildren.org/uploads/1/3/2/6/132682882/bipulamagopi.pdf
    • https://cdn.shopify.com/s/files/1/0447/4427/8170/files/malayalam_theological_books.pdf
    • https://cdn.shopify.com/s/files/1/0433/3069/9414/files/60721465466.pdf
    • https://cdn.shopify.com/s/files/1/0432/8659/3694/files/conjuntivitis_bacteriana_tratamiento.pdf
    • https://cdn.shopify.com/s/files/1/0435/8189/8913/files/29483488206.pdf
    • https://cdn.shopify.com/s/files/1/0434/4751/7341/files/alabama_abortion_law_text.pdf
    • https://cdn.shopify.com/s/files/1/0429/6910/4540/files/lalomepadevofefivu.pdf
    • https://cdn.shopify.com/s/files/1/0431/0623/8613/files/faritolataluvaroli.pdf
    • https://cdn.shopify.com/s/files/1/0430/7006/2754/files/54861154194.pdf
    • https://cdn.shopify.com/s/files/1/0431/0440/3613/files/zomomegaweduxusisu.pdf
    • https://cdn.shopify.com/s/files/1/0431/1567/5809/files/retib.pdf
    • https://cdn.shopify.com/s/files/1/0428/2833/3212/files/bapare.pdf
    • https://cdn.shopify.com/s/files/1/0429/1880/5657/files/muledi.pdf
    • https://cdn.shopify.com/s/files/1/0431/3461/5706/files/91342008525.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_off00005898.bin
9d601356db4489e421ab2467617642152065f468469ab3fc6acf6049c974cdab		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5898 5708 bytes
font_01_sfnt_off00006be1.bin
dd46db56949f0ae30ed8e0b9ba218a6492859b2deef3fea6db1a5758f7628522		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6BE1 10444 bytes

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