Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fc7baa5086e7f8b…

MALICIOUS

PDF

51.3 KB Created: 2020-08-08 05:03:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 70b9f48413331d2f9e0cd8e84252f83b SHA-1: 8dbb61df98a7a96e48ee5beeb1454f13e4e0c5f2 SHA-256: 5fc7baa5086e7f8b3ff3f852feb9db80db8b2d7bc09c7a22d53b1d465fff5cf1
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to potentially malicious redirector infrastructure. The heuristic PDF_SEO_LINK_FARM indicates a link farm designed to manipulate search engine results, and PDF_MALICIOUS_REDIRECTOR_LINK confirms a link to known malicious infrastructure. The document body contains obfuscated text and URLs, suggesting an attempt to disguise the malicious intent. No scripts were extracted, but the overall structure points to a phishing or redirection scheme.

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.ru/pify?keyword=antologias+de+cuentos+pdf
    • http://naxokut.farmerandhippie.com/uploads/1/3/1/8/131856257/davane_jumut_zujekun.pdf
    • http://files.customweddingsofcolorado.com/uploads/1/3/0/7/130776208/jegotixa.pdf
    • http://files.broadcastcoffeeroasters.com/uploads/1/3/0/9/130969448/bubibize.pdf
    • http://files.tzaddi.net/uploads/1/3/0/7/130775970/jewozerigapu-mabekoziku-dukug.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0439/9579/1518/files/how_to_use_wii_u_usb_helper.pdf
    • https://cdn.shopify.com/s/files/1/0428/7981/1750/files/luroxumobibedobemazetogu.pdf
    • https://cdn.shopify.com/s/files/1/0438/1189/7504/files/jumusisizoloda.pdf
    • https://cdn.shopify.com/s/files/1/0432/6758/8252/files/multi_step_equations_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0429/6055/2085/files/52559776439.pdf
    • https://cdn.shopify.com/s/files/1/0434/7405/9426/files/43038904201.pdf
    • https://cdn.shopify.com/s/files/1/0430/3316/5986/files/jatetedotazowopisutido.pdf
    • https://cdn.shopify.com/s/files/1/0433/3430/3912/files/vesafelulanisus.pdf
    • https://cdn.shopify.com/s/files/1/0430/7235/6514/files/chapter_2_neil_simon.pdf
    • https://cdn.shopify.com/s/files/1/0431/2068/9306/files/69747720403.pdf
    • https://cdn.shopify.com/s/files/1/0432/7525/5972/files/mapisofuxisedekilisazil.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_off00007a04.bin
12fdeaf8967305083bb4e23c6d520752480724d0c1baa296acb3764ad516d37a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A04 5096 bytes
font_01_sfnt_off00008b70.bin
5d0814da3a586419dd8f810142eca5d81e45f0a618f4f5f16261bc673b6fd476		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8B70 11760 bytes
font_02_sfnt_off0000b0c1.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB0C1 4324 bytes

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