Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a67889b72b7a6c8…

MALICIOUS

PDF

49.2 KB Created: 2021-05-16 10:12:30 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 43c5d20fcd2c627253e586945456c18a SHA-1: 6b272d800deef7d5261fdab321f672710cca697d SHA-256: 5a67889b72b7a6c8c39249252d3689b39d6bb5bb905b0712a434c05c4c17ddd1
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to known malicious redirectors and lures users with promises of free game hacks. The document body, though partially corrupted, contains a primary URL that aligns with the heuristic findings. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the lures suggest a phishing or malware distribution attempt, likely initiated via a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9228

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.xyz/app/431946152/free-dominus-roblox-game-hack In PDF document text
    • http://arpinoturismo.it/images/how-to-make-your-own-minecraft-pe-server-for-free_GM479516143.pdfIn PDF document text
    • http://arpinoturismo.it/images/free-minecraft-accounts-2021_GM479516143.pdfIn PDF document text
    • http://arpinoturismo.it/images/claimrbx-free-robux_GM431946152.pdfIn PDF document text
    • http://arpinoturismo.it/images/easy-robux-today_GM431946152.pdfIn PDF document text
    • http://arpinoturismo.it/images/mcpe-optifine_GM479516143.pdfIn PDF document text
    • http://arpinoturismo.it/images/minecraft-bedrock-free-server-hosting_GM479516143.pdfIn PDF document text
    • http://arpinoturismo.it/images/free-coin-master-app_GM406889139.pdfIn PDF document text
    • http://arpinoturismo.it/images/free-coin-master-spins-no-verification_GM406889139.pdfIn PDF document text
    • http://arpinoturismo.it/images/coin-master-free-spins-link-2021-april_GM406889139.pdfIn PDF document text
    • http://arpinoturismo.it/images/coin-master-free-spin-reward-links_GM406889139.pdfIn PDF document text
    • http://arpinoturismo.it/images/coin-master-free-spins-link-blogspot-today_GM406889139.pdfIn PDF document text
    • http://arpinoturismo.it/images/free-robux-no-downloading-apps_GM431946152.pdfIn PDF document text
    • http://arpinoturismo.it/images/coin-master-daily-free-spins-link-today-haktuts_GM406889139.pdfIn PDF document text
    • http://arpinoturismo.it/images/coin-master-free-spins-youthnow_GM406889139.pdfIn PDF document text
    • http://arpinoturismo.it/images/how-to-make-my-own-coin-master-cards-hack_GM406889139.pdfIn PDF document text
    • http://arpinoturismo.it/images/how-do-you-get-free-food-on-coin-master_GM406889139.pdfIn PDF document text
    • http://arpinoturismo.it/images/free-robux-codes-2021-not-used_GM431946152.pdfIn PDF document text
    • http://arpinoturismo.it/images/hack-version-of-coin-master_GM406889139.pdfIn PDF document text
    • http://arpinoturismo.it/images/free-links-coin-master_GM406889139.pdfIn PDF document text
    • http://arpinoturismo.it/images/how-to-get-roblox-premium-for-free_GM431946152.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_003_off000047fd.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x47FD 28960 bytes
SHA-256: 94c954b07076665837b6a0f398d00b3d798a094b61ef0b5fa05dfb162d5dfa7a
font_01_sfnt_off00008937.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8937 8264 bytes
SHA-256: 832a024f86889f979d33bfc6e3457d942b203c3822784c20457c61560c7c7b51
font_02_sfnt_off00009d0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9D0F 18636 bytes
SHA-256: 46fcbd6c3115277ac11b91f3289357a32fe2ba94719b4dbd56ea725e5d096b3c

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