Malicious PDF — malware analysis report

Static analysis result for SHA-256 8241522e8f130799…

MALICIOUS

PDF

41.4 KB Created: 2020-08-27 13:47:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7dfd5bc097f3054f13ed972961a99a3b SHA-1: 1112a01fa72d3271f051624a6a37182becdf3cbe SHA-256: 8241522e8f130799490074f019140e6f151053057757701fc6140fad6e0ef7e7
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external PDF files, suggesting a link farm for SEO manipulation or malware distribution. One prominent URL, https://ttraff.cc/pify?keyword=like+mike+pelicula+completa+en+espa%25C3%25B1ol+latino+descargar+mega, is flagged as a malicious redirector. The document body, though partially corrupted, contains text related to movie downloads and the malicious URL, reinforcing the lure. The ML classifier also strongly indicated maliciousness.

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=like+mike+pelicula+completa+en+espa%25C3%25B1ol+latino+descargar+mega
    • http://gerigibum.studio-pp.com/uploads/1/3/0/8/130874629/291a7e4a01b.pdf
    • http://files.nextlane360.com/uploads/1/3/1/1/131163736/4705508.pdf
    • http://files.gowildfoundation.org/uploads/1/3/1/1/131163872/4316257.pdf
    • http://files.paigemmitchell.com/uploads/1/3/1/4/131437362/vazazuko-zabaderu-delatabaful.pdf
    • http://luwumel.drdavidharrismusic.org/uploads/1/3/0/8/130814017/nodemo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0436/4537/0518/files/articulacion_de_la_cadera.pdf
    • https://cdn.shopify.com/s/files/1/0432/3832/6432/files/map_testing_scores_chart_2012.pdf
    • https://cdn.shopify.com/s/files/1/0430/8962/5250/files/w_4_personal_allowances_worksheet_instructions.pdf
    • https://cdn.shopify.com/s/files/1/0450/9233/9877/files/algorithm_design_manual_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0434/0085/5706/files/dijeveboramixiwog.pdf
    • https://cdn.shopify.com/s/files/1/0434/1386/4602/files/pa_driver_manual.pdf
    • https://cdn.shopify.com/s/files/1/0431/5214/6586/files/kuwodudomevegega.pdf
    • https://cdn.shopify.com/s/files/1/0432/7614/0710/files/pdf_adobe_acrobat_reader_8_free.pdf
    • https://cdn.shopify.com/s/files/1/0429/0261/8278/files/61387046845.pdf
    • https://cdn.shopify.com/s/files/1/0433/3489/3718/files/outlook_calendar_invite_on_android_phone.pdf
    • https://cdn.shopify.com/s/files/1/0429/8647/1587/files/basicity_of_pyrrole.pdf
    • https://cdn.shopify.com/s/files/1/0463/2628/4445/files/selomikel.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
font_00_sfnt_off00004e9c.bin
4cb19334e3171275b2fc7af8f601c418ef4c80d603e1230a70af03e8c295c71c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4E9C 4388 bytes
font_01_sfnt_off00005df9.bin
b5c95ef0bd47552c71bc6eb1952827d93c36330a7432a95693f2e1b236a3d2dd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5DF9 5608 bytes
font_02_sfnt_off000070ac.bin
e531c926a13046ce95dd4f90e55c69e7164edc92bccfc61812f3b525d9098058		 pdf-font-stream PDF embedded font (sfnt) at offset 0x70AC 11072 bytes

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