Malicious PDF — malware analysis report

Static analysis result for SHA-256 03d34e3155e2c45e…

MALICIOUS

PDF

53.2 KB Created: 2021-06-08 16:12:09 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 40f64517756390769454f0011e5b5b1d SHA-1: 7acc3a22f0ae4578dfb2cbb4027f976579e229ff SHA-256: 03d34e3155e2c45e031f03c866ec49d2d3aa1acfb969d2ef3d33689105b3dc4c
300 Risk Score

Malware Insights

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

The PDF contains multiple links to redirectors and SEO link farms, masquerading as game hacks and free spins. The heuristic 'SE_FAKE_CAPTCHA' suggests a user interaction is required to proceed, likely to trick the user into downloading a payload. The presence of numerous external links indicates a broad distribution attempt, consistent with a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9616

Heuristics 7

  • 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.
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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/roblox-shard-seekers-hack-game-hack In PDF document text
    • https://library.sttbandung.ac.id/repository/free-modded-minecraft-server_GM479516143.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/coin-master-free-spins-daily-1-ga_GM406889139.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/hacks-roblox_GM431946152.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/pro-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/how-to-block-someone-on-coin-master_GM406889139.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/moon-static-coin-master-generator-hacks-free_GM406889139.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/coin-master-free-spin-today-2021_GM406889139.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/how-to-hack-coin-master-cheat-engine_GM406889139.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/free-roblox-account-username-and-password_GM431946152.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/coin-master-hack-no-verification_GM406889139.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/roblox-bux-free_GM431946152.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/mcpe-master-hack-unlimited-coins-latest-version_GM406889139.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/get-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/is-there-a-way-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/how-to-get-spins-for-free-on-coin-master_GM406889139.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/www-free-robux-com_GM431946152.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/roblox-free-clothes-codes_GM431946152.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/minecraft-creative-mode-free_GM479516143.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/lucky-patcher-coin-master-hack_GM406889139.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/free-spins-coin-master-2021_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_off00005579.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5579 27520 bytes
SHA-256: b6ad21616a676dc34062b2c1ab42cca38760ab5f215869a4d5c0ab87cb54c98b
font_01_sfnt_off0000944c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x944C 7420 bytes
SHA-256: 0b188308ab0e7ffce9913d63d697a586f2937cafc51a771db38e3a566cd37e24
font_02_sfnt_off0000acbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xACBB 18524 bytes
SHA-256: 80093e13cfe9ef77457d33d3f96ee6fc7014a46eda119dfd20bc6d8d87371253

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