Malicious PDF — malware analysis report

Static analysis result for SHA-256 134917165a68c56c…

MALICIOUS

PDF

51.9 KB Created: 2020-07-28 07:37:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 24ff00b7028e341275ea207cec340eb6 SHA-1: cfd2ef52fe173812ae24c18cc32741b03ed62b47 SHA-256: 134917165a68c56c56d20a856de16fafc20a840b66bc5401994624c97858b33c
154 Risk Score

Malware Insights

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

This PDF file contains numerous embedded links, a significant portion of which point to a redirector service known for malicious activity. The document body, though heavily obfuscated, suggests a lure related to 'formwork plywood sheets'. The presence of embedded links and the ML classifier's high confidence score 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.ru/pify?keyword=formwork+plywood+sheets
    • http://files.keckmanagementroofing.com/uploads/1/3/1/4/131406348/mejivap_farex.pdf
    • http://files.ctodddesigns.com/uploads/1/3/0/7/130774962/362352.pdf
    • http://files.melodydye.com/uploads/1/3/1/4/131454286/04ac14fdc12.pdf
    • http://files.worldwarc.ca/uploads/1/3/2/6/132680986/917b154c60c8.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0427/4746/1788/files/duwopiwexuruduzirofi.pdf
    • https://cdn.shopify.com/s/files/1/0434/2838/0839/files/87331062230.pdf
    • https://cdn.shopify.com/s/files/1/0437/9246/6080/files/rodefubopusulonizafowume.pdf
    • https://cdn.shopify.com/s/files/1/0438/4201/1286/files/nolosexovusogitopetog.pdf
    • https://cdn.shopify.com/s/files/1/0432/6303/3502/files/xukepit.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/sarexomerowomowubufo.pdf
    • https://cdn.shopify.com/s/files/1/0429/7234/8579/files/79545565970.pdf
    • https://cdn.shopify.com/s/files/1/0431/7950/7870/files/zejoligeba.pdf
    • https://cdn.shopify.com/s/files/1/0429/9610/5375/files/72670034571.pdf
    • https://cdn.shopify.com/s/files/1/0430/9227/9445/files/ziniwurarukubovefexosu.pdf
    • https://cdn.shopify.com/s/files/1/0430/7084/9181/files/56265005617.pdf
    • https://cdn.shopify.com/s/files/1/0436/3078/8758/files/binexezumevorez.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_off00008da1.bin
d4203eea8028641d7b425361abdd2265216e4446f78f8dbb6244f01939374c87
pdf-font-stream PDF embedded font (sfnt) at offset 0x8DA1 4836 bytes
font_01_sfnt_off00009e32.bin
e2d7c568f58aa9374e6d3f1511edd48c3063239af79719ae43c7122559db41ee
pdf-font-stream PDF embedded font (sfnt) at offset 0x9E32 10764 bytes