Malicious PDF — malware analysis report

Static analysis result for SHA-256 0cd26262b1c652e2…

MALICIOUS

PDF

43.5 KB Created: 2021-05-13 00:05:11 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: afb27015e4442ffab8bbd2084df97001 SHA-1: c8bfbe238b80cade2106e2cb39375272ce758782 SHA-256: 0cd26262b1c652e26356dd3354e55448b0c3b8d315949b5542b6cc2a5af3e0bd
200 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a lure for 'Instant Robux' and impersonates Microsoft, strongly suggesting a credential phishing or malware distribution attempt. The embedded URL 'https://netcdn.xyz/app/431946152/instant-robux-game-hack' is flagged as a malicious redirector and associated with brand impersonation. While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate a malicious intent to redirect the user to a potentially harmful site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

Heuristics 5

  • PDF links to a 'free generator / game hack' redirector critical PDF_GAME_HACK_REDIRECT_LURE
    PDF's clickable action targets a redirector of the form /app/<id>/<slug>-game-hack — the landing-page shape of a large SEO 'free spins / generator / game hack' lure family that funnels victims through rotating disposable hosts to a malware/scam payload. The multi-link variants also trip ML/link-farm rules; this catches the single-link variants that otherwise score clean. CRITICAL on its own: the /app/<id>/<slug>-game-hack path shape is unambiguous scam infra, and the host rotates so a host-list match can't be relied on.
  • 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.
  • Brand-impersonation credential phishing lure high SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: call-to-action link host does not match the impersonated brand: https://netcdn.xyz/app/431946152/instant-robux-game-hack.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://netcdn.xyz/app/431946152/instant-robux-game-hack In PDF document text
    • https://elearning.mtsalkhairaatternate.sch.id/__statics/gudangsoal/files/spinuri-gratis-coin-master_GM406889139.pdfIn PDF document text
    • https://elearning.mtsalkhairaatternate.sch.id/__statics/gudangsoal/files/free-2021-robux_GM431946152.pdfIn PDF document text
    • https://elearning.mtsalkhairaatternate.sch.id/__statics/gudangsoal/files/robuxmatchcon_GM431946152.pdfIn PDF document text
    • https://elearning.mtsalkhairaatternate.sch.id/__statics/gudangsoal/files/minecraft-games-online-free-no-download_GM479516143.pdfIn PDF document text
    • https://elearning.mtsalkhairaatternate.sch.id/__statics/gudangsoal/files/how-to-hack-roblox-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://elearning.mtsalkhairaatternate.sch.id/__statics/gudangsoal/files/roblox-free-draw_GM431946152.pdfIn PDF document text
    • https://elearning.mtsalkhairaatternate.sch.id/__statics/gudangsoal/files/hack-coin-master-no-human-verification_GM406889139.pdfIn PDF document text
    • https://elearning.mtsalkhairaatternate.sch.id/__statics/gudangsoal/files/free-robux-master_GM431946152.pdfIn PDF document text
    • https://elearning.mtsalkhairaatternate.sch.id/__statics/gudangsoal/files/coin-master-codes_GM406889139.pdfIn PDF document text
    • https://elearning.mtsalkhairaatternate.sch.id/__statics/gudangsoal/files/free-robux-without-downloading-anything_GM431946152.pdfIn PDF document text
    • https://elearning.mtsalkhairaatternate.sch.id/__statics/gudangsoal/files/free-roblox-card-codes_GM431946152.pdfIn PDF document text
    • https://elearning.mtsalkhairaatternate.sch.id/__statics/gudangsoal/files/official-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • https://elearning.mtsalkhairaatternate.sch.id/__statics/gudangsoal/files/get-free-cards-in-coin-master_GM406889139.pdfIn PDF document text
    • https://elearning.mtsalkhairaatternate.sch.id/__statics/gudangsoal/files/how-to-hack-coin-master-spin-ios_GM406889139.pdfIn PDF document text
    • https://elearning.mtsalkhairaatternate.sch.id/__statics/gudangsoal/files/roblox-rape-hack_GM431946152.pdfIn PDF document text
    • https://elearning.mtsalkhairaatternate.sch.id/__statics/gudangsoal/files/how-to-get-free-pet-food-in-coin-master_GM406889139.pdfIn PDF document text
    • https://elearning.mtsalkhairaatternate.sch.id/__statics/gudangsoal/files/how-to-make-your-own-minecraft-server-for-free_GM479516143.pdfIn PDF document text
    • https://elearning.mtsalkhairaatternate.sch.id/__statics/gudangsoal/files/coin-master-free-food-for-pet_GM406889139.pdfIn PDF document text
    • https://elearning.mtsalkhairaatternate.sch.id/__statics/gudangsoal/files/coin-master-game-2021-free-spin-link_GM406889139.pdfIn PDF document text
    • https://elearning.mtsalkhairaatternate.sch.id/__statics/gudangsoal/files/free-draw-roblox_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004c91.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4C91 25584 bytes
SHA-256: 115cbc71b2f76bcfe504114349ba22d80422fae6da15848a68d7e0e82d9b0f0d
font_01_sfnt_off000087eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x87EB 18184 bytes
SHA-256: 234f9e95fa1241feb438ae0efba81c56d05ba2863eb0b0d090bdd6eb60e49a51

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