Malicious PDF — malware analysis report

Static analysis result for SHA-256 16b61416e2374574…

MALICIOUS

PDF

52.7 KB Created: 2020-08-02 09:08:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: af459b2fe2bcb67a64bb25e5c036d6c4 SHA-1: 6999a8194ef4483aa5e5b2465f87e6ba4d999d2f SHA-256: 16b61416e23745744691f0769f11cbe530bb4758afe0c941186ffa75d295ecc1
154 Risk Score

Malware Insights

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

The PDF contains a link that redirects to known malicious infrastructure, disguised as a movie download. The ML classifier strongly indicated maliciousness, and the PDF structure includes a link farm, suggesting an attempt to distribute malicious content or engage in SEO manipulation for malicious purposes. The embedded URL is the primary indicator of malicious intent.

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=tamil+movies+2015+download
    • http://files.hilarycoolidge.com/uploads/1/3/1/6/131637308/e233a24aee450.pdf
    • http://files.miss-america-protest.com/uploads/1/3/2/7/132740214/gozadibo.pdf
    • http://files.harrisburgelementary.org/uploads/1/3/0/7/130776031/5397573.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0429/8535/7463/files/97595347636.pdf
    • https://cdn.shopify.com/s/files/1/0430/2936/4889/files/take_5_sheet_music.pdf
    • https://cdn.shopify.com/s/files/1/0435/8651/9195/files/vepafaweridofuj.pdf
    • https://cdn.shopify.com/s/files/1/0434/5639/7464/files/4460710186.pdf
    • https://cdn.shopify.com/s/files/1/0431/7904/9121/files/47257068755.pdf
    • https://cdn.shopify.com/s/files/1/0433/3872/7589/files/zebapafisojapanorozazogos.pdf
    • https://cdn.shopify.com/s/files/1/0431/7623/1063/files/nubokupokilabomiro.pdf
    • https://cdn.shopify.com/s/files/1/0428/6621/3031/files/60729332395.pdf
    • https://cdn.shopify.com/s/files/1/0429/6923/5619/files/zumuxiluxab.pdf
    • https://cdn.shopify.com/s/files/1/0427/6027/4087/files/65389960919.pdf
    • https://cdn.shopify.com/s/files/1/0433/4852/5208/files/jetusufibuwuwe.pdf
    • https://cdn.shopify.com/s/files/1/0437/1546/1275/files/zojifatir.pdf
    • https://cdn.shopify.com/s/files/1/0430/4433/9861/files/74048622317.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000082b9.bin
b3624839053d2ea1a3c812566b2d4069b6a31c2e8d78af7fbb29deb4c7a5ca5b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x82B9 5136 bytes
font_01_sfnt_off00009432.bin
260f3b209e1843ae3cfb7d579ea5105de9d167c9a71e593a9d3029ed41d89d86		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9432 10272 bytes
font_02_sfnt_off0000b751.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB751 4324 bytes

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