Malicious PDF — malware analysis report

Static analysis result for SHA-256 d38454b179bb7ec3…

MALICIOUS

PDF

43.0 KB Created: 2021-05-17 07:57:09 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-12
MD5: fe187813cf5bb6e2b96a7eac0e630d13 SHA-1: 2c84a21c0cc0e88a74ada7b1bc1450cd62f9e01a SHA-256: d38454b179bb7ec325bdee78452b734f80d1401755be072ceea856a9b8f5aacd
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains numerous links to malicious redirectors and SEO link farms, masquerading as game hacks and generators. The primary lure appears to be related to Roblox and Coin Master, aiming to trick users into visiting potentially harmful websites. The document's structure and embedded links strongly suggest a phishing or scamming attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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.
  • 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.
  • 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/roblox-fly-hack-game-hack In PDF document text
    • https://zabota-kashira.ru/images/how-many-free-spin-links-is-there-for-coin-master_GM406889139.pdfIn PDF document text
    • https://zabota-kashira.ru/images/how-to-get-free-coins-in-coin-master-game_GM406889139.pdfIn PDF document text
    • https://zabota-kashira.ru/images/roblox-free-clothes-generator_GM431946152.pdfIn PDF document text
    • https://zabota-kashira.ru/images/roblox-t-shirt-free_GM431946152.pdfIn PDF document text
    • https://zabota-kashira.ru/images/free-roblox-accounts-with-robux-that-work-2021_GM431946152.pdfIn PDF document text
    • https://zabota-kashira.ru/images/how-to-hack-coin-master-apple_GM406889139.pdfIn PDF document text
    • https://zabota-kashira.ru/images/coin-master-hack-online-no-human-verification_GM406889139.pdfIn PDF document text
    • https://zabota-kashira.ru/images/coin-master-hack-tool-v1-9-download-free-pc_GM406889139.pdfIn PDF document text
    • https://zabota-kashira.ru/images/200-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://zabota-kashira.ru/images/how-to-get-minecraft-windows-10-for-free-2021_GM479516143.pdfIn PDF document text
    • https://zabota-kashira.ru/images/coinmasterdailyfreespins-com_GM406889139.pdfIn PDF document text
    • https://zabota-kashira.ru/images/rbx-claim_GM431946152.pdfIn PDF document text
    • https://zabota-kashira.ru/images/coin-master-hacked-apk-download-for-android_GM406889139.pdfIn PDF document text
    • https://zabota-kashira.ru/images/free-robux-no-verification-2021-android_GM431946152.pdfIn PDF document text
    • https://zabota-kashira.ru/images/coin-master-free-cards-link_GM406889139.pdfIn PDF document text
    • https://zabota-kashira.ru/images/how-to-get-free-robux-for-real_GM431946152.pdfIn PDF document text
    • https://zabota-kashira.ru/images/free-robux-generator-no-survey-no-download-no-human-verification_GM431946152.pdfIn PDF document text
    • https://zabota-kashira.ru/images/worst-roblox-avatars_GM431946152.pdfIn PDF document text
    • https://zabota-kashira.ru/images/strucid-aimbot_GM431946152.pdfIn PDF document text
    • https://zabota-kashira.ru/images/easy-robux-today_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_off000047d6.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x47D6 26088 bytes
SHA-256: bc8bff4436a8b3f45a667a2f2ddcd773ec93e6fcdf6c9819b3d91b3864ee16e4
font_01_sfnt_off00008522.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8522 18528 bytes
SHA-256: 48aa5298b09ebe1486756ea90f1095ff6b224374f32c9ff4b9ed1390be9ca915

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