Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e5b909338bc3bf0…

MALICIOUS

PDF

50.6 KB Created: 2020-07-20 06:13:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7b9fa1bc3a82240d39f3d398911edb22 SHA-1: 7fe9ad8587d693258fe152e401da7a495bdf0cee SHA-256: 5e5b909338bc3bf0b7396335f70a0ae69a4c0378b2f01e77462d90ffaf93f0bf
154 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to redirector infrastructure or external PDF files, indicating a link farm or redirection attempt. The ML classifier strongly flagged this PDF as malicious, and the presence of a redirector link further supports malicious intent. No scripts were extracted, but the primary attack pattern involves luring users to potentially malicious websites via embedded links.

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/wb?keyword=algorithm%20development%20in%20c%20pdf
    • http://files.stdavidscranbury.com/uploads/1/3/2/7/132740620/6fbc1549a.pdf
    • http://files.iluvmyhairbysonia.com/uploads/1/3/1/3/131398515/284492.pdf
    • http://files.berendesteam.com/uploads/1/3/1/1/131164572/lapote_gazob_renobon_gugariweg.pdf
    • http://files.physicstrialtestteam.com.au/uploads/1/3/0/7/130776714/2900394.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/0801/6027/files/mamumubukasasirenagotufu.pdf
    • https://cdn.shopify.com/s/files/1/0433/4295/4661/files/46226605981.pdf
    • https://cdn.shopify.com/s/files/1/0431/5453/8658/files/19740840945.pdf
    • https://cdn.shopify.com/s/files/1/0430/4456/9242/files/91740261405.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/99839510681.pdf
    • https://xiletemud.files.wordpress.com/2020/06/selefoz.pdf
    • https://vumarebef.files.wordpress.com/2020/06/rivetikajaliretosut.pdf
    • https://rekaxetif.files.wordpress.com/2020/06/67286976193.pdf
    • https://cdn.shopify.com/s/files/1/0435/6187/7665/files/diwufadewevapusago.pdf
    • https://cdn.shopify.com/s/files/1/0433/3495/9256/files/3920733971.pdf
    • https://cdn.shopify.com/s/files/1/0431/4228/3432/files/47374024061.pdf
    • https://cdn.shopify.com/s/files/1/0430/2821/8010/files/gexoriferididi.pdf
    • https://cdn.shopify.com/s/files/1/0432/8043/3302/files/rimapi.pdf
    • https://cdn.shopify.com/s/files/1/0427/8904/4383/files/fivogupujifijororoje.pdf
    • https://cdn.shopify.com/s/files/1/0432/8282/5371/files/zoxelupuvukonuzedibosunak.pdf
    • https://cdn.shopify.com/s/files/1/0428/9937/4233/files/28033156864.pdf
    • https://cdn.shopify.com/s/files/1/0430/0328/1571/files/roxuxigowawerapigigol.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_off0000834e.bin
a170da4476a6ef514fe1e7437ad340619e33f25be40696f43d296889a07735e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x834E 5020 bytes
font_01_sfnt_off00009440.bin
30dfed75723d8a74cc38aa4366541dcaab5180b8a9c982f21c2d32357bb82cbb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9440 12436 bytes

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