Malicious PDF — malware analysis report

Static analysis result for SHA-256 6da1b07a5e46ff7a…

MALICIOUS

PDF

52.0 KB Created: 2020-07-29 21:32:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 56ac19486b4390374e00deb7251e5c78 SHA-1: 19e6f0a6c8e6cf2559c989bff714aef17f3b96a6 SHA-256: 6da1b07a5e46ff7a32fe4f46d3b952b06b95fa2b129bf73b697d408748e9a91a
154 Risk Score

Malware Insights

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

The PDF contains a high number of embedded links, many pointing to external PDF files, suggesting an SEO link farm. One critical heuristic identified a link to known malicious redirector infrastructure, indicating a malicious intent to redirect users to harmful sites. The ML classifier also 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=bidayatul+mujtahid+urdu+pdf+download
    • http://files.mscg19.com/uploads/1/3/0/7/130739852/dotom.pdf
    • http://files.moruyaanglican.org/uploads/1/3/0/7/130776644/bobulime_zivuke.pdf
    • http://files.compellingministries.com/uploads/1/3/0/9/130970003/5f85f40e7e273c.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0437/0890/7688/files/12406464149.pdf
    • https://cdn.shopify.com/s/files/1/0433/4590/3781/files/zudenumaliso.pdf
    • https://cdn.shopify.com/s/files/1/0431/4287/3249/files/84299919805.pdf
    • https://cdn.shopify.com/s/files/1/0432/6955/4332/files/vejimujedizuzugiwagotekuf.pdf
    • https://cdn.shopify.com/s/files/1/0435/8271/8115/files/nozivorutaguzawerebofemi.pdf
    • https://cdn.shopify.com/s/files/1/0432/8960/8360/files/23976877966.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/36149341097.pdf
    • https://cdn.shopify.com/s/files/1/0433/6844/8152/files/41438384017.pdf
    • https://cdn.shopify.com/s/files/1/0431/4906/6397/files/visepodisezifezam.pdf
    • https://cdn.shopify.com/s/files/1/0431/6246/8516/files/87980496289.pdf
    • https://cdn.shopify.com/s/files/1/0430/4466/7553/files/34190566038.pdf
    • https://cdn.shopify.com/s/files/1/0430/1537/2949/files/56622189891.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005f53.bin
10ceeb2713e3558981b018bb9f2afdff39c6a4e7952710fe1ddfa5647fa7b369		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F53 5184 bytes
font_01_sfnt_off000070e0.bin
d71ac661baf2945876a70075443968553ebd4178f7750921515ca8a768ff1c0e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x70E0 15120 bytes
font_02_sfnt_off0000a008.bin
7f129ab47ea1e6030c4cd0ccf6e95f57ccad1d814c31574257c62e9ed49e1f30		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA008 19360 bytes

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