Malicious PDF — malware analysis report

Static analysis result for SHA-256 f11278143a7eb8fb…

MALICIOUS

PDF

44.4 KB Created: 2021-06-09 12:46:05 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-26
MD5: e0cd33ff7c4ca0d2b68a5f80725ed8ea SHA-1: 8fb671b1abe8685a5486c88b1f827ee641b30804 SHA-256: f11278143a7eb8fb1303b2e3459881df296cacfe1c22b3f919f41883e00b4bb8
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external sites, including a known malicious redirector, that promote game hacks and scams. The document body and extracted URLs strongly suggest a phishing or scamming attempt, likely distributed as a spearphishing attachment. No scripts were extracted, but the heuristic firings indicate a malicious redirector and a lure for game-related cheats.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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.tw/app/431946152/roblox-place-view-bot-hack-fourme-game-hack In PDF document text
    • http://elibrary.smknesbu.sch.id/repository/free-robux-generator-no-ads-or-surveys_GM431946152.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/haktuts-coin-master-free-daily-spins_GM406889139.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/pixies-gigantic-coin-master-free-spins-and-coins_GM406889139.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/robux-generator-no-verification-2021_GM431946152.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/hack-the-coin-master-game_GM406889139.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/coin-master-fun-free-spins_GM406889139.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/minecraft-tools_GM479516143.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/minecraft-maps-pe-free-download_GM479516143.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/roblox-aockolupse-hack-mod-menu_GM431946152.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/coin-master-cheats_GM406889139.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/coin-master-free-spins-link-2021_GM406889139.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/rbl-gg-free-robux_GM431946152.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/free-links-for-coin-master_GM406889139.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/free-robux-generator-without-verification_GM431946152.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/links-to-get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/free-coin-master-spins-and-coins_GM406889139.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/how-to-hack-in-roblox-prison-life_GM431946152.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/how-to-get-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/coin-master-free-soins_GM406889139.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/assassin-hack-roblox-2021_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_off00005073.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5073 24316 bytes
SHA-256: 5e965d9e52e82e6377cd158c07b02039a00696135fddc88a9b72e0e9b2628637
font_01_sfnt_off00008784.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8784 19424 bytes
SHA-256: becf0a58985fe6db28d2c6b5c2425ce769d8bed54394d915fb0d19cc570a16d7

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