Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d672d304b39b449…

MALICIOUS

PDF

49.8 KB Created: 2021-06-10 20:14:20 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 1430d0111435329d3897e6c7f27d6396 SHA-1: 373fe743322ccb4a66bf82d17efc3d963e3a59cf SHA-256: 6d672d304b39b44973c308c6f8be1091d7d7930c9747c4e55811dc94a85bc011
240 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to known malicious redirectors, including one that masquerades as a 'free generator / game hack'. The document body and embedded links promote lures for game hacks and free currency, consistent with phishing or scam tactics. The presence of numerous links to external PDFs, many with SEO-like titles, suggests an attempt to drive traffic to potentially malicious content or ad farms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9796

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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/how-to-get-free-robux-button-game-hack In PDF document text
    • http://stikespantirapih.ac.id/home/repository/coin-master-free-cards-2021_GM406889139.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/free-robux-without-verification_GM431946152.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/coin-master-free-coins-and-spins-2021_GM406889139.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/free-spins-coins-coin-master_GM406889139.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/coin-master-hacks_GM406889139.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/coin-master-free-spins-link_GM406889139.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/coin-master-free-spins-and-coins-for-today_GM406889139.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/roblox-hack-2021_GM431946152.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/hack-to-send-gold-cards-on-coin-master_GM406889139.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/how-to-hack-to-get-robux_GM431946152.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/free-roblox-accounts-with-robux_GM431946152.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/coin-master-free-spins-link-2021-iphone_GM406889139.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/robux-miner_GM431946152.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/free-ways-to-get-robux_GM431946152.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/como-descargar-roblox-hackeado-con-robux_GM431946152.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/100-free-spins-for-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/easy-robux-hack_GM431946152.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/free-coins-and-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/free-coins-and-spins-link-for-coin-master_GM406889139.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/minecraft-pe-apk-free-download_GM479516143.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_off0000537d.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x537D 25356 bytes
SHA-256: 7b52a10e397ae76fce8e65c4d19d2b1d0973dd1e239e056639191c6b22857a8d
font_01_sfnt_off00008e9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8E9B 7272 bytes
SHA-256: f462303657ce1de10d3e7d5ae1fe17c8584116bd5bc216971166de87266da924
font_02_sfnt_off0000a00c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA00C 18280 bytes
SHA-256: 66de8ed8e3644103acbd9188664210a5508c1510d18ccb415178623f15f231fe

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