Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d5f6c27e214fe8a…

MALICIOUS

PDF

39.1 KB Created: 2020-07-31 21:33:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1f64db6f391d386de99f7b5c7e80c6a2 SHA-1: b17b7e70726346ceb5fcc679f039fce65be88428 SHA-256: 6d5f6c27e214fe8a8fcdfedafb4906130ba3fa75a2e3765790f226531a4bbdd1
154 Risk Score

Malware Insights

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

This PDF document is classified as malicious due to its inclusion of a large number of external links, many of which point to a redirector service. The document body, though obfuscated, contains a URL that appears to be part of a link farm designed to improve search engine rankings for specific keywords, likely as a lure. The presence of numerous links, including one to a known malicious redirector, indicates an attempt to direct 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.ru/pify?keyword=2013+subaru+outback+owner%2527+s+manual+pdf
    • http://files.makingmathmiracles.com/uploads/1/3/1/6/131606854/9c00dd070.pdf
    • http://files.creeksidepto.com/uploads/1/3/0/8/130873839/roxejimoj-tewupipugabokor-nulurigedagi-zaxakegar.pdf
    • http://files.bromswoldbikefest.org/uploads/1/3/0/9/130968943/f504cf93e3d31.pdf
    • http://files.philipleong.com.au/uploads/1/3/1/4/131407767/c99664f10433.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/1321/8210/files/26936183850.pdf
    • https://cdn.shopify.com/s/files/1/0427/4293/9814/files/93659415946.pdf
    • https://cdn.shopify.com/s/files/1/0432/3383/7219/files/72035871116.pdf
    • https://cdn.shopify.com/s/files/1/0431/3638/5181/files/nolajerexufofiwu.pdf
    • https://cdn.shopify.com/s/files/1/0431/7744/3483/files/tizodumepapotisula.pdf
    • https://cdn.shopify.com/s/files/1/0435/5260/4319/files/56662945370.pdf
    • https://cdn.shopify.com/s/files/1/0429/6271/4773/files/28458134147.pdf
    • https://cdn.shopify.com/s/files/1/0429/3450/1535/files/moladulugusinogu.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/66491839223.pdf
    • https://cdn.shopify.com/s/files/1/0430/8877/3269/files/6768418581.pdf
    • https://cdn.shopify.com/s/files/1/0429/1470/9663/files/16575573111.pdf
    • https://cdn.shopify.com/s/files/1/0430/8575/8628/files/mosunakujufa.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005740.bin
bcecccd6c1c511d60cfa2d967b1ba136006e1106e3767d76b11362abcac638f1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5740 6028 bytes
font_01_sfnt_off00006bc8.bin
9099786f498224502e48e241cc4353a7b70db4c91c38c05337933598c5491cb9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6BC8 10448 bytes

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