Malicious PDF — malware analysis report

Static analysis result for SHA-256 1140e32b61f802ee…

MALICIOUS

PDF

54.2 KB Created: 2020-08-03 23:52:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b6ed7ffe5ec0576e8f0976cb471731dd SHA-1: c4473712c2643de46cec85a175c2757b2cdae188 SHA-256: 1140e32b61f802ee59617d0812a54931460559a5a520148f19d83dfd4a492aa4
162 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, specifically pointing to 'ttraff.cc'. The document body, though heavily obfuscated, contains text related to academic papers and includes the same malicious URL. The presence of numerous other PDF links, many hosted on Shopify, suggests a link farm designed to obscure the ultimate destination. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/wb?keyword=madras%20university%20distance%20education%20mba%20question%20papers%20with%20answers%20pdf
    • http://files.newlifeagspanishfort.com/uploads/1/3/2/6/132680974/rezoxilokebokozo.pdf
    • http://files.lucianamagdalena.com/uploads/1/3/2/6/132681665/5178879.pdf
    • http://files.leadershipembodimentasia.com/uploads/1/3/2/6/132696194/kabalawaloxefomubula.pdf
    • http://fedorahosted.org/lohit
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/6377/1293/files/budopen.pdf
    • https://cdn.shopify.com/s/files/1/0428/0179/1132/files/linisufenojikok.pdf
    • https://cdn.shopify.com/s/files/1/0435/5417/7183/files/zugojigabijinodevo.pdf
    • https://cdn.shopify.com/s/files/1/0432/2384/2983/files/robe_of_the_archmagi_pathfinder.pdf
    • https://cdn.shopify.com/s/files/1/0429/9181/2771/files/petirer.pdf
    • https://cdn.shopify.com/s/files/1/0432/2174/5822/files/socket_io_github.pdf
    • https://cdn.shopify.com/s/files/1/0428/1552/0935/files/68086652017.pdf
    • https://cdn.shopify.com/s/files/1/0431/7495/3124/files/keihin_carburetor_manual_download.pdf
    • https://cdn.shopify.com/s/files/1/0440/5755/9190/files/gibevowitof.pdf
    • https://cdn.shopify.com/s/files/1/0431/1960/7962/files/pezavovilufaxiziguz.pdf
    • https://cdn.shopify.com/s/files/1/0429/9328/7321/files/lipajedemuvegedixuluxe.pdf
    • https://cdn.shopify.com/s/files/1/0428/0143/0695/files/22627554399.pdf
    • https://cdn.shopify.com/s/files/1/0432/3019/9966/files/nixaverofaviwe.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
stream_005_off00008433.bin
9dd2de12fbdae8e24f0b6da8c605dfd127d42b1b0bcb2b07f7421ad53f07368e		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x8433 13916 bytes
font_00_sfnt_off00007035.bin
94e61f94cf01a8e3294efc652a619a0efadb97cd209c8f9fc54e6fb73ba12907		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7035 5888 bytes
font_02_sfnt_off0000a65c.bin
56e41058fedf5a43a399284abf98711fed89d3b91ce4213ebff9b3bfc680c4ef		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA65C 10540 bytes

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