Malicious PDF — malware analysis report

Static analysis result for SHA-256 6523e91996297f57…

MALICIOUS

PDF

56.6 KB Created: 2020-09-07 10:43:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 95b1adc26f469d4ac48641b8eba65785 SHA-1: b4f413cf64ff40c183171dfa6d17b42479b92be0 SHA-256: 6523e91996297f57b47e52cd3ee7bafc1d9a6663d2eca8d01ee6739099ccc84f
154 Risk Score

Malware Insights

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

The PDF contains a link to a redirector service, which is a common tactic for delivering malicious payloads or phishing pages. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' confirms this behavior. Additionally, the PDF contains a large number of external links, suggesting it is part of a link farm designed to attract traffic. No scripts were extracted, but the presence of embedded URLs and the ML classifier's high confidence indicate malicious intent.

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.link/pify?keyword=dangal+movie+parents+guide
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/b8c837_6da7b54f7b7f46569769888c5aff26c1.pdf
    • https://static.usrfiles.com/ugd/5e8de6_71b44601e4ca41afa5f2f4dda9c80939.pdf
    • https://static.usrfiles.com/ugd/66f7a0_9dcfbe66f095413cb8761ee4ea68cf8c.pdf
    • https://cdn.shopify.com/s/files/1/0435/3972/6487/files/lower_back_pain_physical_therapy_exercises.pdf
    • https://cdn.shopify.com/s/files/1/0431/4651/0504/files/kijoditenis.pdf
    • https://cdn.shopify.com/s/files/1/0438/4250/2818/files/hands-_on_artificial_intelligence_fo.pdf
    • https://cdn.shopify.com/s/files/1/0432/4678/0566/files/diruvugoxanirililifasi.pdf
    • https://static.usrfiles.com/ugd/9ea9b6_e700b5f558b0483bb4831aa48394400c.pdf
    • https://static.usrfiles.com/ugd/d01287_689c30f30a624f18ac85d6eb5a236a0f.pdf
    • https://static.usrfiles.com/ugd/b1dabf_ef0d2b9071ac480ab650f8b677aba084.pdf
    • https://cdn.shopify.com/s/files/1/0434/7206/0573/files/50370367922.pdf
    • https://cdn.shopify.com/s/files/1/0434/5351/3880/files/bjt_amplifier_theory.pdf
    • https://cdn.shopify.com/s/files/1/0429/3243/7158/files/6077592416.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_off000089ef.bin
58def48f4625546ca7fee1e365455ad9bfcc3d9b72b1e3db323a69da19a91e9f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x89EF 5336 bytes
font_01_sfnt_off00009c0e.bin
faec7ecfac00d5c4da265b088aef9a417d46c85cb1fb42590301c8822e2a43a8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9C0E 10436 bytes
font_02_sfnt_off0000bff8.bin
e296a61d2d303e35be9e1a35631556663d2780498efa7e8f3867bf557f172fe6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBFF8 16164 bytes

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