Malicious PDF — malware analysis report

Static analysis result for SHA-256 18a4d1abed82d29d…

MALICIOUS

PDF

37.0 KB Created: 2021-07-04 10:19:38 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-21
MD5: a78366592b878cd8b50e7e93c2f72bfa SHA-1: 2db79c97cd5a97aa5d68834289f1c1e6eddf315b SHA-256: 18a4d1abed82d29dad2e141aab8d6a55c2ba77a242a9047984f53e2954a5b711
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains multiple links to known malicious redirectors and SEO link farms, masquerading as game hacks and free currency generators. The primary lure is a 'Coin Master 70 Spin Link' directing users to http://netcdn.tw/app/406889139/coin-master-70-spin-link-game-hack. The document also contains a large number of links to PDF files hosted on stikespantirapih.ac.id, likely part of a link farm to improve search engine ranking for malicious content. No scripts were extracted, but the presence of numerous malicious links and the lure indicate a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9886

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/406889139/coin-master-70-spin-link-game-hack In PDF document text
    • http://stikespantirapih.ac.id/home/repository/minecraft-education-free_GM479516143.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/how-to-hack-coin-master-with-game-guardian_GM406889139.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/how-to-get-robux-for-free-without-hacking_GM431946152.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/chisel-and-bits-mod-minecraft-pe_GM479516143.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/how-to-earn-free-stars-on-coin-master_GM406889139.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/earn-robux-today_GM431946152.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/how-to-hack-aimbot-in-breaking-point-roblox_GM431946152.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/how-to-get-minecraft-realms-for-free_GM479516143.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/how-do-u-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/haktuts-coin-master-free-daily-spins_GM406889139.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/dragonball-online-revelations-roblox-hack_GM431946152.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/how-to-hack-in-arsenal_GM431946152.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/free-roblox-hair-girl_GM431946152.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/actual-free-robux_GM431946152.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/how-to-get-free-robux-easy-hack_GM431946152.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/khaos-free-robuxcom_GM431946152.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/robux-hack-pastebin-2021_GM431946152.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/free-robux-group_GM431946152.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/best-roblox-hacks_GM431946152.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/games-that-give-free-robux_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
font_00_sfnt_off00003055.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3055 22628 bytes
SHA-256: 8f5df0acad5a1390f4ea0ceb835188148a0f914af42ddb848595c4c2725514fa
font_01_sfnt_off00006307.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6307 2896 bytes
SHA-256: c1a618813a64314343402b2ec738fc11c4c912460a4c7ae3029924d2f9a229cd
font_02_sfnt_off00006cec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6CEC 18408 bytes
SHA-256: 316924fe7a637b0af78a439fcac8455cfd3756d9fde101b7ffeceeaf4bf174e0

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