Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9b02896e23bc073…

MALICIOUS

PDF

54.9 KB Created: 2021-06-11 01:52:01 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-26
MD5: b0561ff39847bb764ebb5dce930de111 SHA-1: c4361e1a0bce20982db5cbe09c37da755aaec60d SHA-256: c9b02896e23bc073fcd07a9849117db418d93d556a61ecad5f165086dae961df
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple heuristics indicating it is a malicious redirector lure, specifically targeting users interested in game hacks. The embedded URL leads to a known malicious redirector infrastructure. The document body, though heavily obfuscated, contains references to the same URL, reinforcing the lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9535

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/how-to-hack-someone-on-roblox-like-anonymous-game-hack In PDF document text
    • http://lib.stimykpn.ac.id//repository/free-minecraft-bedrock-server-hosting_GM479516143.pdfIn PDF document text
    • http://lib.stimykpn.ac.id//repository/coin-master-unlimited-spin-hack_GM406889139.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/getting-cheated-on-in-roblox_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/free-bling-bling-card-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/how-to-change-roblox-username-for-free-2021_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id//repository/https-oprewards-com-roblox_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id//repository/free-robux-rewards_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id//repository/coinmaster-com_GM406889139.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/how-to-get-free-robux-2021-pc-easy_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/minecraft-free-trial_GM479516143.pdfIn PDF document text
    • http://lib.stimykpn.ac.id//repository/free-minecraft-account-and-password-2021_GM479516143.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/free-robux-survey_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id//repository/pokemon-go-free-lures_GM1094591345.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/roblox-tix-accont-free_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/roblox-super-power-training-simulator-token-hack_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/coin-master-hack-apk-iphone_GM406889139.pdfIn PDF document text
    • http://lib.stimykpn.ac.id//repository/free-unlimited-robux_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/free-robux-without-doing-anything_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/reddit-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/https-iosgodscom-topic-20218flipmastercoinshack_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00005651.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5651 26068 bytes
SHA-256: 9349ff6c61e9e2a37aa5d14cb4ed36f3935a6b8cacdc0280474820335b09bf51
font_01_sfnt_off000092f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x92F8 3884 bytes
SHA-256: 40b61f8938bd710dc29dc58ba3fde91c245a6a69596ec569b4d27c769ca417cf
font_02_sfnt_off00009f9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9F9A 7448 bytes
SHA-256: a76ff9b4805dcff342f7268a16e2e3c2ff2b31b96c381fe4deb6ceea777bce90
font_03_sfnt_off0000b17d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB17D 19044 bytes
SHA-256: 93c5a422d2ad069e9f48dd93e50727793d424c513ac632535c1a2fa62b237c84

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