Malicious PDF — malware analysis report

Static analysis result for SHA-256 61d8c7815d5f1858…

MALICIOUS

PDF

49.9 KB Created: 2020-08-24 06:20:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 007596edb7f371f1b02c33434b038a89 SHA-1: 853b7ea60ebbb62c51c4ad9f22f446176f0993d3 SHA-256: 61d8c7815d5f1858ef907f64cbc18832d7b65892b1095add65baa7cb4132f401
154 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to a link farm designed to redirect users to malicious sites, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body itself contains obfuscated text and the URL https://ttraff.cc/pify?keyword=bangla+hd+natok++website, suggesting a phishing or scam lure. No scripts were extracted, but the structure and link farm indicate a malicious intent to redirect users to potentially harmful content.

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=bangla+hd+natok++website
    • http://files.koahspearguns.com/uploads/1/3/0/8/130813849/worabugesezu_fowipe.pdf
    • http://files.cornerstone-civil.com/uploads/1/3/1/3/131378950/254407.pdf
    • http://nitoduza.morehousechicago.com/uploads/1/3/0/7/130775436/moligutotemaretoguto.pdf
    • http://tibejon.awananet.org/uploads/1/3/0/8/130873826/pevigufupon.pdf
    • http://files.fulcrumfireartsvt.com/uploads/1/3/1/8/131872015/3506555.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/6533/5208/files/remuluwuxavojeliwezug.pdf
    • https://cdn.shopify.com/s/files/1/0430/0128/2719/files/eyebrow_raised_emoji.pdf
    • https://cdn.shopify.com/s/files/1/0428/5821/7631/files/3049667620.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/lunugituvalu.pdf
    • https://cdn.shopify.com/s/files/1/0438/2212/1122/files/74344803839.pdf
    • https://cdn.shopify.com/s/files/1/0449/6248/0296/files/bazuvegubiw.pdf
    • https://cdn.shopify.com/s/files/1/0428/9649/0663/files/43379980992.pdf
    • https://cdn.shopify.com/s/files/1/0437/0569/6407/files/58862509430.pdf
    • https://cdn.shopify.com/s/files/1/0451/3693/7125/files/akito_the_exiled_ep_5.pdf
    • https://cdn.shopify.com/s/files/1/0433/7192/1571/files/1614025870.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://www.geocities.com/mitra_anirban/hobbies.htmGNU
    • http://www.gnu.org/copyleft/gpl.htmRegular

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005af0.bin
75e7eabc653ae9e6364ce09a074cca97713c14e64e9e4da05ffb7de399d8d3d1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5AF0 5336 bytes
font_01_sfnt_off00006d1e.bin
b247fdecb33e2077b8aac6085093c38830af5a481f41a865b700e574c99bdcb5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6D1E 10504 bytes
font_02_sfnt_off00008d65.bin
07ecde503da4517b8f20e35e4c6cab051d84b79abe310f3c2ada97187e7d04e7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8D65 1852 bytes
font_03_sfnt_off00009657.bin
48bada4715537cc803986e549e816c02fc0541f8bef5f380674757d15626303e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9657 10504 bytes

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