Malicious PDF — malware analysis report

Static analysis result for SHA-256 a39713798a055c03…

MALICIOUS

PDF

46.0 KB Created: 2021-06-03 09:17:26 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 1dd05fae9ac629e5a030baee9883b337 SHA-1: 04c0426d83faf613583ac45289eb68da1e29f277 SHA-256: a39713798a055c03c2c3580dfe4ffa9acdc2f5108e11c3f4df222600745d04f0
260 Risk Score

Malware Insights

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

The PDF contains multiple links to known malicious redirectors and a link farm, aiming to trick users into downloading further malicious content. The presence of a fake CAPTCHA heuristic indicates an attempt to deceive users into executing commands or interacting with the document in an unintended way. The document body and heuristics suggest a lure related to game hacks and free spins, which is a common social engineering tactic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9797

Heuristics 6

  • 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
  • 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.online/app/406889139/free-spins-coin-master-ios-links-game-hack In PDF document text
    • http://educhina.mn/editor/files/coin-master-daily-spin-free_GM406889139.pdfIn PDF document text
    • http://educhina.mn/editor/files/coin-master-download_GM406889139.pdfIn PDF document text
    • http://educhina.mn/editor/files/claim-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://educhina.mn/editor/files/mangocheats-com-hack-coin-master-cheat_GM406889139.pdfIn PDF document text
    • http://educhina.mn/editor/files/roblox-free-robux-codes_GM431946152.pdfIn PDF document text
    • http://educhina.mn/editor/files/mcpe-master-unlimited-coins-hack-apk_GM406889139.pdfIn PDF document text
    • http://educhina.mn/editor/files/games-on-roblox-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • http://educhina.mn/editor/files/free-robux-that-actually-works-2021_GM431946152.pdfIn PDF document text
    • http://educhina.mn/editor/files/offers-to-complete-and-get-free-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://educhina.mn/editor/files/free-robux-for-kids_GM431946152.pdfIn PDF document text
    • http://educhina.mn/editor/files/how-to-get-free-robux-gift-cards_GM431946152.pdfIn PDF document text
    • http://educhina.mn/editor/files/free-coin-master-spins-without-human-verification_GM406889139.pdfIn PDF document text
    • http://educhina.mn/editor/files/coinmaster-spin-ml_GM406889139.pdfIn PDF document text
    • http://educhina.mn/editor/files/coin-master-free-spins-link-blogspot_GM406889139.pdfIn PDF document text
    • http://educhina.mn/editor/files/earn-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://educhina.mn/editor/files/twitter-coin-master-free-spins-link_GM406889139.pdfIn PDF document text
    • http://educhina.mn/editor/files/free-coin-master-coins-and-spins_GM406889139.pdfIn PDF document text
    • http://educhina.mn/editor/files/roblox-system_GM431946152.pdfIn PDF document text
    • http://educhina.mn/editor/files/coin-master-free-spin-and-coins-links-2021_GM406889139.pdfIn PDF document text
    • http://educhina.mn/editor/files/get-free-robux-without-human-verification_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_004_off00004fda.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4FDA 24620 bytes
SHA-256: 010ffd2a12a50631a50b4b3931701a8cba50bf181647f8813bb3feb3b0391fbb
font_01_sfnt_off00008824.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8824 2840 bytes
SHA-256: 3fb127b764b9d10f5525bc4de5ec8316de704409ccb0cf21cff3ad8a30d11676
font_02_sfnt_off000091d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x91D6 18056 bytes
SHA-256: 00725aa741ebcaa50a6a2e905640ddff238fc768dd22f8bd491d0bb4569388e9

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