Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ef03f79f4aa7f6b…

MALICIOUS

PDF

119.0 KB Created: 2020-08-09 06:46:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: abb1d2c62ca22a04007626992d053d3f SHA-1: b8cc8f066f06fe9f55b558d37c190811122e4b8e SHA-256: 4ef03f79f4aa7f6b37ca6137a6a8490909f90d7c543bc093faa65ff20756e846
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous embedded links, with one specifically identified as a malicious redirector. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external PDF links, suggesting a tactic to manipulate search results or distribute further malicious content. The ML classifier also strongly flagged this file as malicious. No scripts were extracted, and the document body was heavily obfuscated, limiting further analysis of the specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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=silabus+biologi+sma+kelas+xi+ktsp+pdf
    • http://files.tomorrowstechnologytoday.org/uploads/1/3/0/7/130775565/fididiwegaf-xadekinari.pdf
    • http://files.stpeterswhitstable.org.uk/uploads/1/3/0/8/130874668/mobulotulugi-worirovewiko-gijazez-lokufitore.pdf
    • http://files.opticsource-bg.com/uploads/1/3/1/8/131871692/rimow-jasidumizuto.pdf
    • https://cdn.shopify.com/s/files/1/0431/1007/2481/files/halfling_ghostwise_5e.pdf
    • https://cdn.shopify.com/s/files/1/0435/7311/7086/files/penguin_books_level_6.pdf
    • https://cdn.shopify.com/s/files/1/0432/9229/5333/files/git_add_patch.pdf
    • https://cdn.shopify.com/s/files/1/0427/6404/2396/files/vozosala.pdf
    • https://cdn.shopify.com/s/files/1/0452/8416/3746/files/c_basic_interview_questions_for_freshers.pdf
    • https://cdn.shopify.com/s/files/1/0449/5107/7032/files/national_geographic_magazine_1888.pdf
    • https://cdn.shopify.com/s/files/1/0433/4757/4943/files/nowog.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/fakuwonilojovaxibudebu.pdf
    • https://cdn.shopify.com/s/files/1/0433/0265/0014/files/35914188624.pdf
    • https://cdn.shopify.com/s/files/1/0433/3617/1688/files/download_bansal_classes_study_material.pdf
    • https://cdn.shopify.com/s/files/1/0434/1425/7815/files/scrum_a_pocket_guide.pdf
    • https://cdn.shopify.com/s/files/1/0434/4116/0344/files/sindrome_di_berardinelli_seip.pdf
    • https://cdn.shopify.com/s/files/1/0430/0147/9321/files/13932775200.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/

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001833c.bin
cfc55d9a86105951a0c0598cefe0d629088cf08e084d12ad585de259e0d116a0
pdf-font-stream PDF embedded font (sfnt) at offset 0x1833C 1716 bytes
font_01_sfnt_off00018b91.bin
c52fe3f325d1669c5c62d8b84ee15af2c937a0912552290b20773c6e87b36657
pdf-font-stream PDF embedded font (sfnt) at offset 0x18B91 5640 bytes
font_02_sfnt_off00019eae.bin
4af2131cad59d7abb9c49ac57f4218d9bffe213554c4ee337ce9130ebbb668eb
pdf-font-stream PDF embedded font (sfnt) at offset 0x19EAE 15524 bytes