Malicious PDF — malware analysis report

Static analysis result for SHA-256 c926f5d92deaaaf4…

MALICIOUS

PDF

44.5 KB Created: 2021-05-11 22:32:23 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 9cecad955ed4b3b3fe6ca6545c3b387d SHA-1: c0083d1185db39be728ba218f5fa56b9fd6e4db0 SHA-256: c926f5d92deaaaf4838f0168febebb40d2e35d809022e5d6a35e66c3b4dd830c
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document employs a common lure of free game currency and hacks to entice users. It contains a high density of external links, many pointing to PDF files on the mobtakerancell.ir domain, suggesting a link farm designed to distribute further malicious content or host phishing pages. The ML classifier strongly indicated maliciousness, and the presence of numerous embedded URLs supports a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 5

  • 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.
  • PDF links to a 'free generator / game hack' redirector high 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.
  • 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
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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/406889139/free-spins-for-coin-master-2021-game-hack PDF link annotation
    • http://mobtakerancell.ir/assets/uploads/pages/files/op-rewards-robux_GM431946152.pdfIn PDF document text
    • http://mobtakerancell.ir/assets/uploads/pages/files/hack-coin-master-for-free_GM406889139.pdfIn PDF document text
    • http://mobtakerancell.ir/assets/uploads/pages/files/free-spin-link-for-coin-master-game_GM406889139.pdfIn PDF document text
    • http://mobtakerancell.ir/assets/uploads/pages/files/free-spins-coin-master-no-human-verification_GM406889139.pdfIn PDF document text
    • http://mobtakerancell.ir/assets/uploads/pages/files/free-spins-on-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://mobtakerancell.ir/assets/uploads/pages/files/how-to-get-spins-on-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://mobtakerancell.ir/assets/uploads/pages/files/coin-master-free-spins-and-coins-today_GM406889139.pdfIn PDF document text
    • http://mobtakerancell.ir/assets/uploads/pages/files/free-robux-with-no-survey_GM431946152.pdfIn PDF document text
    • http://mobtakerancell.ir/assets/uploads/pages/files/rbx-gg-free-robux_GM431946152.pdfIn PDF document text
    • http://mobtakerancell.ir/assets/uploads/pages/files/win-free-robux_GM431946152.pdfIn PDF document text
    • http://mobtakerancell.ir/assets/uploads/pages/files/free-robux-codes-2021_GM431946152.pdfIn PDF document text
    • http://mobtakerancell.ir/assets/uploads/pages/files/100-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://mobtakerancell.ir/assets/uploads/pages/files/free-coin-master-cheats_GM406889139.pdfIn PDF document text
    • http://mobtakerancell.ir/assets/uploads/pages/files/free-robux-games-that-actually-work-2021_GM431946152.pdfIn PDF document text
    • http://mobtakerancell.ir/assets/uploads/pages/files/coin-master-free-spins-uk_GM406889139.pdfIn PDF document text
    • http://mobtakerancell.ir/assets/uploads/pages/files/how-to-get-free-robux-without-surveys_GM431946152.pdfIn PDF document text
    • http://mobtakerancell.ir/assets/uploads/pages/files/coin-master-hacks-2021_GM406889139.pdfIn PDF document text
    • http://mobtakerancell.ir/assets/uploads/pages/files/how-to-hack-roblox-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://mobtakerancell.ir/assets/uploads/pages/files/hack-coin-master-343-apk_GM406889139.pdfIn PDF document text
    • http://mobtakerancell.ir/assets/uploads/pages/files/rbxdemon_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_off000049f6.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x49F6 30388 bytes
SHA-256: 5e44d1bec10b0fd3cf7ee70b2164e6855b2575c7ce2478ef02cb30ff422d9202
font_01_sfnt_off00008bdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8BDB 18288 bytes
SHA-256: 66febbde5b4b2b6a44609229e8681f3f0581fff3ed5f82ed8e3d83342858c217

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