Malicious PDF — malware analysis report

Static analysis result for SHA-256 093d57444ed4cc3b…

MALICIOUS

PDF

42.5 KB Created: 2020-08-06 12:38:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a50c346cb8cda228ba3a44b7d71d7ed4 SHA-1: 681051084b6f5ffaf53971b052a3a7fc80dc0424 SHA-256: 093d57444ed4cc3be5f82376f0ea69efefb75a9ab7d290f3cd12811fd401d3ac
154 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to benign Shopify URLs, but one critical link redirects to known malicious infrastructure. The ML classifier strongly indicates maliciousness. The document body, though heavily obfuscated, contains the URL that is also flagged by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic, suggesting a lure to a malicious site.

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=remove+watermark+pdf+mac+free
    • http://files.klineseminars.com/uploads/1/3/0/9/130969172/8454922.pdf
    • http://files.aninvisiblethreadnovel.com/uploads/1/3/2/6/132681863/tefurolim-pegovezoluvidig-gesiberek.pdf
    • http://files.forestburgumc.com/uploads/1/3/1/3/131381363/fovimoxebudeduz_dasodubamimit_sozuxapuki_kofomaditados.pdf
    • http://files.tabletalkcleveland.org/uploads/1/3/0/8/130873995/6030321.pdf
    • http://files.mydesignpictures.com/uploads/1/3/1/4/131438541/8132906.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0437/8152/1565/files/network_layers_osi.pdf
    • https://cdn.shopify.com/s/files/1/0427/9812/1119/files/excel_print_to_blank_page.pdf
    • https://cdn.shopify.com/s/files/1/0428/5592/3878/files/hbs-_750_manual.pdf
    • https://cdn.shopify.com/s/files/1/0430/6108/4322/files/example_of_monitoring_and_evaluation_plan.pdf
    • https://cdn.shopify.com/s/files/1/0427/9376/2975/files/befapidopesuvixavu.pdf
    • https://cdn.shopify.com/s/files/1/0431/4107/1016/files/wuduzo.pdf
    • https://cdn.shopify.com/s/files/1/0427/6341/9815/files/nibodupetokupojula.pdf
    • https://cdn.shopify.com/s/files/1/0429/8558/6841/files/mejovazebusumuk.pdf
    • https://cdn.shopify.com/s/files/1/0431/3687/6695/files/20372590412.pdf
    • https://cdn.shopify.com/s/files/1/0428/6775/3116/files/94641699953.pdf
    • https://cdn.shopify.com/s/files/1/0436/8180/8549/files/poptropica_survivor_island.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_off0000684c.bin
62e125ee4f43a7823be0a8a39a8fb43bd7ff48a646f00254f61614bfcab5b4c7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x684C 5316 bytes
font_01_sfnt_off00007a67.bin
48a4a0fbac69a55f057cca5d049339ebb56f6189b50a2bcc0c4bbbd5d054b32f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A67 10068 bytes

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