Malicious PDF — malware analysis report

Static analysis result for SHA-256 99f881719f4039dd…

MALICIOUS

PDF

49.2 KB Created: 2021-06-11 04:45:21 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: c6f3ae728fd77c4a99b9a7921686089d SHA-1: 6b0fd7b27b5713ae50445958324f523528c1624f SHA-256: 99f881719f4039dde4507e19923a948d9affe78d951a831c70782de18a9e02a8
242 Risk Score

Malware Insights

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

This PDF document contains numerous links to external websites, many of which are hosted on 'prom2m.ru' and masquerade as game hacks or free item generators for popular games like Roblox and Coin Master. The document also contains a direct link to 'netcdn.tw' which is also related to Roblox cheats. These lures are indicative of credential phishing or a gateway to malware distribution. The presence of a 'secret recovery' lure and brand impersonation further supports a phishing or scamming intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9796

Heuristics 7

  • 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.
  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • PDF links to a 'free generator / game hack' redirector high 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.
  • 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.tw/app/431946152/roblox-cheat-wall-glitch-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
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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.tw/app/431946152/roblox-cheat-wall-glitch-game-hack PDF link annotation
    • https://prom2m.ru/wp-content/uploads/fsqm-files/coin-master-free-daily-spins-and-coins_GM406889139.pdfIn PDF document text
    • https://prom2m.ru/wp-content/uploads/fsqm-files/roblox-forsaken-sword-3-hack_GM431946152.pdfIn PDF document text
    • https://prom2m.ru/wp-content/uploads/fsqm-files/robux-hack-no-verification-at-all_GM431946152.pdfIn PDF document text
    • https://prom2m.ru/wp-content/uploads/fsqm-files/how-to-set-skybox-roblox-hack_GM431946152.pdfIn PDF document text
    • https://prom2m.ru/wp-content/uploads/fsqm-files/roblox-hacking-websites-free_GM431946152.pdfIn PDF document text
    • https://prom2m.ru/wp-content/uploads/fsqm-files/free-girl-clothes-roblox_GM431946152.pdfIn PDF document text
    • https://prom2m.ru/wp-content/uploads/fsqm-files/hacks-for-phantom-forces-roblox_GM431946152.pdfIn PDF document text
    • https://prom2m.ru/wp-content/uploads/fsqm-files/free-robux-without-doing-anything_GM431946152.pdfIn PDF document text
    • https://prom2m.ru/wp-content/uploads/fsqm-files/free-robux-websites-that-actually-work-2021_GM431946152.pdfIn PDF document text
    • https://prom2m.ru/wp-content/uploads/fsqm-files/how-do-you-get-thengs-roblox-for-free_GM431946152.pdfIn PDF document text
    • https://prom2m.ru/wp-content/uploads/fsqm-files/videos-de-hacks-para-roblox_GM431946152.pdfIn PDF document text
    • https://prom2m.ru/wp-content/uploads/fsqm-files/how-to-get-roblox-bc-for-free_GM431946152.pdfIn PDF document text
    • https://prom2m.ru/wp-content/uploads/fsqm-files/fashion-frenzy-roblox-free-vip_GM431946152.pdfIn PDF document text
    • https://prom2m.ru/wp-content/uploads/fsqm-files/free-robux-generator-2021-no-human-verification_GM431946152.pdfIn PDF document text
    • https://prom2m.ru/wp-content/uploads/fsqm-files/tiktok-views-free_GM835599320.pdfIn PDF document text
    • https://prom2m.ru/wp-content/uploads/fsqm-files/how-do-u-see-if-u-r-hacked-on-roblox_GM431946152.pdfIn PDF document text
    • https://prom2m.ru/wp-content/uploads/fsqm-files/seraph-roblox-free_GM431946152.pdfIn PDF document text
    • https://prom2m.ru/wp-content/uploads/fsqm-files/how-to-get-a-cape-in-minecraft-for-free_GM479516143.pdfIn PDF document text
    • https://prom2m.ru/wp-content/uploads/fsqm-files/free-robux-codes-no-hack_GM431946152.pdfIn PDF document text
    • https://prom2m.ru/wp-content/uploads/fsqm-files/coin-master-free-spins-today-daily-links_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000054cb.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x54CB 25556 bytes
SHA-256: e65d5e0fb9546f5edcd6b860ae4f2e3f59c821926a42b4564bc97aa0af70b707
font_01_sfnt_off00008f91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8F91 5696 bytes
SHA-256: 450e3ee45915afe13702bf1d587eb8b9ad88a8d2113419ac9f2fd116a828e139
font_02_sfnt_off00009ca2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9CA2 18600 bytes
SHA-256: 3d98bc3f2bd6daaa6f570d37d71629d615d68ec82376f8fec2272eaf35aa0d46