Malicious PDF — malware analysis report

Static analysis result for SHA-256 eec84ee146498934…

MALICIOUS

PDF

50.6 KB Created: 2020-04-27 20:14:43 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6) First seen: 2021-10-07
MD5: 24c220d2579a7a2cf0fc2d12762fb3ca SHA-1: 447f0c07748b72d081506f422b1ec5e4d34bcc38 SHA-256: eec84ee14649893462661b3e8730dd1d4f4e79bab32d14c9fb6c0b4affe6f32d
136 Risk Score

Malware Insights

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

This PDF document contains a link farm of 20 external PDF files, likely intended to drive traffic to malicious content. The document body contains text related to 'brawl stars mod android 1', suggesting a lure for users seeking game modifications. The presence of numerous generated URLs points towards a SEO-based malicious distribution tactic.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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 http://makevotingmatter.net/uploads/1/3/0/4/130476075/130476075.html#%D1%81%D0%BA%D0%B0%D1%87%D0%B0%D1%82%D1%8C+brawl+stars+mod+android+1 PDF link annotation
    • http://transportationinfrastructuredurabilitycenter.org/uploads/1/3/0/5/130547924/munonirati_kipenen_pademakub.pdfIn PDF document text
    • http://dragoncon.us/uploads/1/3/1/0/131070202/denodopemana.pdfIn PDF document text
    • http://oliviaruyter.com/uploads/1/3/1/4/131437566/50a5d.pdfIn PDF document text
    • http://kickout.eu/uploads/1/3/0/5/130588762/a01c289b.pdfIn PDF document text
    • http://koichallenge.com/uploads/1/3/0/5/130588624/3737689.pdfIn PDF document text
    • http://ixominnovations.com/uploads/1/3/1/6/131607174/c2c78ae8d81.pdfIn PDF document text
    • http://cheaptokeeptrees.org/uploads/1/3/1/4/131453199/428a52d1c7cc27.pdfIn PDF document text
    • http://clubimmobilier.website/uploads/1/3/0/2/130291373/9750840.pdfIn PDF document text
    • http://leajoaccessories.com/uploads/1/3/0/6/130639963/puledizu_bawoxasiz_fafukef_gujigeto.pdfIn PDF document text
    • http://teachingeslchina.com/uploads/1/3/0/6/130620861/e207623c.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://www.adobe.com/).NotoIn PDF document text
    • http://www.google.com/get/noto/http://www.adobe.com/type/ThisIn PDF document text
    • http://scripts.sil.org/OFLNotoIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008ea4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8EA4 8468 bytes
SHA-256: e485755e9f963b86a2ccb1d5528d5d7577e9e056130c9afeea718157930cc4d2
font_01_sfnt_off0000af0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF0E 4120 bytes
SHA-256: 979952c1db8c53415e41cd1f6180b65013b69b792cb471c61f4f2d31bf3fd2c0

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