Malicious PDF — malware analysis report

Static analysis result for SHA-256 b25a3a5d517358d6…

MALICIOUS

PDF

52.3 KB Created: 2020-10-21 16:57:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 350994634a54131bec5b4ffeeca523c7 SHA-1: 08bb6a8c22ca628d54e4764020eb2b5f889b31dd SHA-256: b25a3a5d517358d63e88b874317dd87949866bd309c1f6793811874bda743a43
154 Risk Score

Malware Insights

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

This PDF is designed as a lure, embedding a malicious redirector URL disguised as a download link for 'Nela zviadi 2' on Android. The heuristic PDF_SEO_LINK_FARM indicates that the document also contains a large number of links to other PDFs, likely for SEO manipulation or to host further malicious content. The ML classifier strongly flagged this PDF as malicious, and the embedded URL points to known malicious infrastructure.

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/123?keyword=nela+zviadi+2+download+android In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0266/9717/1113/files/diabolik_lovers_reiji_voice_actor.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/5092/0855/files/14335565930.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/4154/9205/files/batatimesok.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/5161/3351/files/vobitorotubebas.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/4155/7146/files/cougar_motor_led_warranty.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0479/3601/2444/files/alchemist_guild_ffxiv.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0266/9625/3636/files/vidimarurofemaxep.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/5537/3720/files/sega_32x_roms_download.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0499/7909/7248/files/momentum_masters_mark_minervini_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/20beb7f0-4220-4f71-9a11-e9c2a93540f2/2616047510.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/948e37c7-7aac-470d-b165-3c476460b8c6/gawovozigugulenanebini.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/42555f3f-5e36-416b-8715-7597562460e9/89591767769.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/30438f72-3c28-4939-ba16-ab1c3cd81625/mere_ghar_aayi_ek_nanhi_pari_remix_m.pdfIn PDF document text
    • https://s3.amazonaws.com/felasorarabipis/bobbin_lace_patterns.pdfIn PDF document text
    • https://s3.amazonaws.com/tetazino/18007756193.pdfIn PDF document text
    • https://s3.amazonaws.com/leguvefu/arduino_programming_cheat_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/mijedusovineti/poxuveliragegexil.pdfIn PDF document text
    • https://s3.amazonaws.com/kavitokolezub/mitukaresevoneru.pdfIn PDF document text
    • https://s3.amazonaws.com/zirojopemup/8961209074.pdfIn PDF document text
    • https://s3.amazonaws.com/felasorarabipis/lipibidegolefimilakolisa.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000066c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x66C9 4944 bytes
SHA-256: 85474769b552b2826c04f3212265289a0c23dee68a7a7efb74df4baa71bac9a6
font_01_sfnt_off000077c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x77C9 12440 bytes
SHA-256: f71613677e280b765798e13acfa81423bcf01787e7dc9e333afad27fc4ec673a
font_02_sfnt_off00009f72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9F72 19936 bytes
SHA-256: 28cedbbe688c1469f6bf82d5a744cec6f98b5affc8d314f85f1b2ca4166324f1

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