Malicious PDF — malware analysis report

Static analysis result for SHA-256 0fa54f297092bac6…

MALICIOUS

PDF

46.4 KB Created: 2020-11-08 02:36:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 7b8364e3bef88bf1b4843838a21ac5b5 SHA-1: 746e0de7e0ae7eff9736ec9ded4331b19aad017d SHA-256: 0fa54f297092bac6d23c20ffa0d088364e9c83ec75bbaca187f08ee16a96ec36
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to PDFs hosted on various platforms, suggesting a link farm or SEO manipulation tactic. One of the embedded URLs, 'https://trafficel.ru/aws?keyword=slime+lab+2+cool+math+games', is presented as a game lure. The ML classifier strongly indicated maliciousness, and the PDF structure itself is flagged for containing a mass of external links.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://trafficel.ru/aws?keyword=slime+lab+2+cool+math+games PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4369525/normal_5f927bece6812.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377381/normal_5f89e580c9ebf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405922/normal_5f96a1493812d.pdfIn PDF document text
    • https://sibomidejuxeda.weebly.com/uploads/1/3/4/5/134599986/vopokukisuderuko.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/sepawi/56892823432.pdfIn PDF document text
    • https://lofapaner.files.wordpress.com/2020/11/45435875795.pdfIn PDF document text
    • https://nekofedis.files.wordpress.com/2020/11/another_day_of_sun_sheet_music_free.pdfIn PDF document text
    • https://s3.amazonaws.com/wapabefizosumi/42106684343.pdfIn PDF document text
    • https://s3.amazonaws.com/vitelitubovuluj/read_the_ancient_magus_bride_manga_online.pdfIn PDF document text
    • https://s3.amazonaws.com/luramamelolem/savoureux_pro_line_ice_cream_maker.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000066b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x66B1 5176 bytes
SHA-256: 510c8b7283975a162a229d8d2989baa55df2632547687593b3cb0af433316eba
font_01_sfnt_off00007846.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7846 11324 bytes
SHA-256: d7aebe5772cdf04f68b6f9be4a4a53ddde33e01b89e6cd229c982a70af08fbbb
font_02_sfnt_off00009ecf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9ECF 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e