Malicious PDF — malware analysis report

Static analysis result for SHA-256 33f2f17082a85617…

MALICIOUS

PDF

44.0 KB Created: 2021-06-08 17:30:30 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 4968646e87c2d7a589a03897bd42bba2 SHA-1: e46fcaaba789609db24eb49fd148ce446c45316a SHA-256: 33f2f17082a85617be5b04e1a22379273e44a4f4f59dbea225b4845f12b49513
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to websites offering game hacks and generators, a common lure for phishing or malware downloads. The heuristic firings indicate the PDF is designed as a link farm, directing users to potentially malicious redirectors and external PDF files. While no scripts were directly extracted, the nature of the lures suggests a malicious intent to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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-generator-code-roblox-game-hack In PDF document text
    • http://library.persadabunda.ac.id/repository/coin-master-in-app-purchase-hack_GM406889139.pdfIn PDF document text
    • http://library.persadabunda.ac.id/repository/free-robux-generator-without-human-verification_GM431946152.pdfIn PDF document text
    • http://library.persadabunda.ac.id/repository/real-hack-for-coin-master_GM406889139.pdfIn PDF document text
    • http://library.persadabunda.ac.id/repository/how-to-actually-get-free-robux_GM431946152.pdfIn PDF document text
    • http://library.persadabunda.ac.id/repository/codes-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://library.persadabunda.ac.id/repository/websites-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://library.persadabunda.ac.id/repository/pokemon-go-free-key_GM1094591345.pdfIn PDF document text
    • http://library.persadabunda.ac.id/repository/how-to-free-robux_GM431946152.pdfIn PDF document text
    • http://library.persadabunda.ac.id/repository/free-robux-codes-2021-not-used_GM431946152.pdfIn PDF document text
    • http://library.persadabunda.ac.id/repository/minecraft-hacked-client-download_GM479516143.pdfIn PDF document text
    • http://library.persadabunda.ac.id/repository/roblox-promo-codes-free-robux_GM431946152.pdfIn PDF document text
    • http://library.persadabunda.ac.id/repository/coin-master--hack_GM406889139.pdfIn PDF document text
    • http://library.persadabunda.ac.id/repository/how-to-get-free-plus-on-meep-city-roblox-2021_GM431946152.pdfIn PDF document text
    • http://library.persadabunda.ac.id/repository/how-to-get-free-spins-on-coin-master-iphone_GM406889139.pdfIn PDF document text
    • http://library.persadabunda.ac.id/repository/real-coin-master-hack-2021_GM406889139.pdfIn PDF document text
    • http://library.persadabunda.ac.id/repository/free-robux-generator_GM431946152.pdfIn PDF document text
    • http://library.persadabunda.ac.id/repository/coin-master-free-spin-best-link_GM406889139.pdfIn PDF document text
    • http://library.persadabunda.ac.id/repository/script-executor-roblox-free_GM431946152.pdfIn PDF document text
    • http://library.persadabunda.ac.id/repository/minecraft-building-hacks_GM479516143.pdfIn PDF document text
    • http://library.persadabunda.ac.id/repository/how-to-get-free-robux-easy-2021_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_off000051a8.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x51A8 24212 bytes
SHA-256: 32ffa2560ae30550f841823a2b538f69429817afe555c005f91e9b67b595943f
font_01_sfnt_off000088d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x88D1 18456 bytes
SHA-256: ebfe68731ebeb1066b778a58e9a9e61f398490c76ff2eeb9f0782efd04e9a31d

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