Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2549fd4030121f4…

MALICIOUS

PDF

44.5 KB Created: 2021-06-09 13:29:36 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: da46ec1cf44c9efaab79cfa7e112b01e SHA-1: cf55b22a41ec0dd0e0a48f1f74827157ce180b7f SHA-256: a2549fd4030121f41bd146dd0062bf922fa8b749fffced7645c87a68bdd9d57a
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to malicious redirectors, disguised as game hacks and generators. The primary link, https://netcdn.tw/app/431946152/robux-cheats-2021-game-hack, is identified as a known malicious redirector. The document body and heuristics indicate a lure for free game currency or hacks, which is a common social engineering tactic. No scripts were extracted, but the presence of malicious links and the lure suggest the intent is to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

Heuristics 4

  • 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.
  • 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.tw/app/431946152/robux-cheats-2021-game-hack In PDF document text
    • https://fordogtrainers.mx:443/images/free-coins-coin-master-hack_GM406889139.pdfIn PDF document text
    • https://fordogtrainers.mx:443/images/coin-master-free-spins-and-coins_GM406889139.pdfIn PDF document text
    • https://fordogtrainers.mx:443/images/moonactive-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • https://fordogtrainers.mx:443/images/how-do-you-get-free-robux-without-doing-anything_GM431946152.pdfIn PDF document text
    • https://fordogtrainers.mx:443/images/get-free-robux-generator_GM431946152.pdfIn PDF document text
    • https://fordogtrainers.mx:443/images/minecraft-launcher-free_GM479516143.pdfIn PDF document text
    • https://fordogtrainers.mx:443/images/trucos-para-free-vip-ultimatesurvival-rpg-roblox_GM431946152.pdfIn PDF document text
    • https://fordogtrainers.mx:443/images/free-robux-legit_GM431946152.pdfIn PDF document text
    • https://fordogtrainers.mx:443/images/300-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://fordogtrainers.mx:443/images/to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://fordogtrainers.mx:443/images/how-to-free-robux_GM431946152.pdfIn PDF document text
    • https://fordogtrainers.mx:443/images/coin-master-daily-free-spins-2021_GM406889139.pdfIn PDF document text
    • https://fordogtrainers.mx:443/images/free-robux-without-verify_GM431946152.pdfIn PDF document text
    • https://fordogtrainers.mx:443/images/coin-master-free-spin-codes_GM406889139.pdfIn PDF document text
    • https://fordogtrainers.mx:443/images/coin-master-free-food_GM406889139.pdfIn PDF document text
    • https://fordogtrainers.mx:443/images/how-to-get-free-robux-promo-codes_GM431946152.pdfIn PDF document text
    • https://fordogtrainers.mx:443/images/how-to-get-2021-robux-for-free_GM431946152.pdfIn PDF document text
    • https://fordogtrainers.mx:443/images/coin-master-free-spins-link-2021-today_GM406889139.pdfIn PDF document text
    • https://fordogtrainers.mx:443/images/roblox-free-robux-com_GM431946152.pdfIn PDF document text
    • https://fordogtrainers.mx:443/images/redeem-roblox-card-free_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_004_off00005028.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5028 25056 bytes
SHA-256: d6435394dd3ef62ed209e4b0d03aeb4ac46f3567b16974f654f2ddbc335ea020
font_01_sfnt_off000089bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x89BF 18752 bytes
SHA-256: 77929033618b9a8f0c535d4afa1599ac1980c883310340dd4da7315c927a8cbc

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