Malicious PDF — malware analysis report

Static analysis result for SHA-256 82fd064c4acf6f41…

MALICIOUS

PDF

47.3 KB Created: 2021-06-08 13:55:13 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 64e7c71fc30ad96927d6e7b8cc473ff8 SHA-1: b7ce1675caa69e479b406c77f6d358d1ecce0542 SHA-256: 82fd064c4acf6f413b99ba239be4ac5c215387a935691f5b90dd52ca01e592ad
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to known malicious redirectors, specifically advertising 'free game hacks' and generators. The document body, though truncated, contains similar lures. The primary heuristic firings indicate a redirection to malicious infrastructure, likely for phishing or malware distribution. No scripts were extracted, but the PDF structure itself facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9832

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/free-roblox-commands-game-hack In PDF document text
    • http://lib.fekon.untad.ac.id/repository/can-you-get-robux-for-free_GM431946152.pdfIn PDF document text
    • http://lib.fekon.untad.ac.id/repository/mobihack-net-roblox-hack_GM431946152.pdfIn PDF document text
    • http://lib.fekon.untad.ac.id/repository/coin-master-daily-spin-free_GM406889139.pdfIn PDF document text
    • http://lib.fekon.untad.ac.id/repository/coin-master-hack-online-pc_GM406889139.pdfIn PDF document text
    • http://lib.fekon.untad.ac.id/repository/coin-master-free-spins-and-coins_GM406889139.pdfIn PDF document text
    • http://lib.fekon.untad.ac.id/repository/unlimited-spin-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://lib.fekon.untad.ac.id/repository/androeed-ru-minecraft_GM479516143.pdfIn PDF document text
    • http://lib.fekon.untad.ac.id/repository/coin-master-game-for-pc-free-download_GM406889139.pdfIn PDF document text
    • http://lib.fekon.untad.ac.id/repository/free-minecraft-severs_GM479516143.pdfIn PDF document text
    • http://lib.fekon.untad.ac.id/repository/coin-master-daily-free-spins-link-today-blogspot_GM406889139.pdfIn PDF document text
    • http://lib.fekon.untad.ac.id/repository/com-hackear-roblox_GM431946152.pdfIn PDF document text
    • http://lib.fekon.untad.ac.id/repository/how-to-hack-roblox-for-robux_GM431946152.pdfIn PDF document text
    • http://lib.fekon.untad.ac.id/repository/free-robux-without-verification-or-survey_GM431946152.pdfIn PDF document text
    • http://lib.fekon.untad.ac.id/repository/minecraft-hacked-client-download_GM479516143.pdfIn PDF document text
    • http://lib.fekon.untad.ac.id/repository/coin-master-daily-free-rewards_GM406889139.pdfIn PDF document text
    • http://lib.fekon.untad.ac.id/repository/promo-codes-for-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.fekon.untad.ac.id/repository/free-robux-no-verification-no-download_GM431946152.pdfIn PDF document text
    • http://lib.fekon.untad.ac.id/repository/minecraft-116-free-download_GM479516143.pdfIn PDF document text
    • http://lib.fekon.untad.ac.id/repository/rbx-land-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.fekon.untad.ac.id/repository/como-tener-robux-hack_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_off00005485.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5485 28428 bytes
SHA-256: b197055de765dae8dcc76601e947c5f272181077e90ef820a3818f7ace9c0505
font_01_sfnt_off000095a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x95A8 18612 bytes
SHA-256: 7213ce101d88bd6ebfbab12b2de194fa017d403cfad498cab38eec1cd0178bc9

Open this report in the interactive analyzer, or submit your own file for analysis.