Malicious PDF — malware analysis report

Static analysis result for SHA-256 81129252f2f81eba…

MALICIOUS

PDF

35.2 KB Created: 2021-07-04 09:48:08 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-23
MD5: bd7ffb53698d4359b69875996805e6e4 SHA-1: 6d082091d52bb164f4d5618648b929fddf8d939e SHA-256: 81129252f2f81eba0dbff0c87a3c181c358ed634a39fdb573baac8f9e9ca10bf
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to known malicious redirectors and SEO link farms, disguised as 'game hacks' and 'free generators'. The document body explicitly mentions 'how-to-make-a-roblox-group-for-free-game-hack' and includes a URL pointing to similar content, indicating a lure for potentially malicious downloads or further redirection. No scripts were extracted, but the PDF structure and embedded URLs strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://netcdn.tw/app/431946152/how-to-make-a-roblox-group-for-free-game-hack In PDF document text
    • https://katalog.smkn1glagah.sch.id/repository/coin-master-hack-ios-2021_GM406889139.pdfIn PDF document text
    • https://katalog.smkn1glagah.sch.id//repository/free-spins-coin-master-without-survey_GM406889139.pdfIn PDF document text
    • https://katalog.smkn1glagah.sch.id/repository/coin-master-hack-co_GM406889139.pdfIn PDF document text
    • https://katalog.smkn1glagah.sch.id/repository/how-to-get-free-robux-working-2021-phone-easy_GM431946152.pdfIn PDF document text
    • https://katalog.smkn1glagah.sch.id/repository/bit-ly-coin-master-hack_GM406889139.pdfIn PDF document text
    • https://katalog.smkn1glagah.sch.id/repository/free-robux-gift-card-codes-unused-2021_GM431946152.pdfIn PDF document text
    • https://katalog.smkn1glagah.sch.id/repository/skyline-revived-roblox-hacking-tool_GM431946152.pdfIn PDF document text
    • https://katalog.smkn1glagah.sch.id/repository/easiest-way-to-upload-audio-on-roblox-for-free-2021_GM431946152.pdfIn PDF document text
    • https://katalog.smkn1glagah.sch.id/repository/free-spins-for-coin-master-game_GM406889139.pdfIn PDF document text
    • https://katalog.smkn1glagah.sch.id/repository/free-robux-hack-in-one-go_GM431946152.pdfIn PDF document text
    • https://katalog.smkn1glagah.sch.id/repository/how-to-get-cheat-engine-roblox-elemental-wars_GM431946152.pdfIn PDF document text
    • https://katalog.smkn1glagah.sch.id/repository/how-to-cheat-in-roblox-vehicle-simulator_GM431946152.pdfIn PDF document text
    • https://katalog.smkn1glagah.sch.id/repository/apk-coin-master-hack_GM406889139.pdfIn PDF document text
    • https://katalog.smkn1glagah.sch.id/repository/good-watch-dogs-hacking-games-on-roblox_GM431946152.pdfIn PDF document text
    • https://katalog.smkn1glagah.sch.id//repository/free-spins-coin-master-2021-hack_GM406889139.pdfIn PDF document text
    • https://katalog.smkn1glagah.sch.id/repository/free-robux-tutorial_GM431946152.pdfIn PDF document text
    • https://katalog.smkn1glagah.sch.id/repository/how-to-get-a-gamepass-on-roblox-for-free_GM431946152.pdfIn PDF document text
    • https://katalog.smkn1glagah.sch.id/repository/offers-to-complete-and-get-free-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • https://katalog.smkn1glagah.sch.id/repository/how-do-you-get-free-robux-on-your-ipad_GM431946152.pdfIn PDF document text
    • https://katalog.smkn1glagah.sch.id//repository/free-robux-no-scam_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
font_00_sfnt_off0000324b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x324B 22164 bytes
SHA-256: 27492e3467166914ca385386b7a879199bd05c59e4be43e9d8f501ad9568c49b
font_01_sfnt_off00006372.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6372 19496 bytes
SHA-256: 14cafe897e1a2f278398660849a051e886c01303fa535fd92545c6b58a09d23d

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