Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f5fca9f35413fe9…

MALICIOUS

PDF

41.8 KB Created: 2021-05-15 03:36:46 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-27
MD5: ad7f0400c830c7f553c0414999c423e7 SHA-1: d795806496dd99935aa88383fa5c6d9060ca2841 SHA-256: 1f5fca9f35413fe9cbb5f1c2a6e8e631dddbdef37f7572e757008c74acca3e26
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains multiple links to a malicious redirector, disguised as game hacks and generators, which is a common lure for phishing or malware distribution. The redirector, in turn, hosts a large number of SEO-optimized PDF links, suggesting a link farm designed to attract victims. The presence of a visual download button further supports a malicious workflow aimed at tricking users into clicking through to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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.xyz/app/479516143/minecraft-multiplayer-free-game-hack In PDF document text
    • http://waldkindergarten-abensberg.de/images/how-to-use-scripts-in-roblox-hack_GM431946152.pdfIn PDF document text
    • http://waldkindergarten-abensberg.de/images/earn-free-robux_GM431946152.pdfIn PDF document text
    • http://waldkindergarten-abensberg.de/images/ac-market-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://waldkindergarten-abensberg.de/images/roblox-robux-generator-no-human-verification_GM431946152.pdfIn PDF document text
    • http://waldkindergarten-abensberg.de/images/free-spins-for-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://waldkindergarten-abensberg.de/images/hacks-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://waldkindergarten-abensberg.de/images/how-to-get-free-followers-on-roblox_GM431946152.pdfIn PDF document text
    • http://waldkindergarten-abensberg.de/images/coin-master-free-spins-link-2021-hack_GM406889139.pdfIn PDF document text
    • http://waldkindergarten-abensberg.de/images/www-free-robux-com_GM431946152.pdfIn PDF document text
    • http://waldkindergarten-abensberg.de/images/coin-master-hacksco_GM406889139.pdfIn PDF document text
    • http://waldkindergarten-abensberg.de/images/free-robux-generator-com-roblox-hack_GM431946152.pdfIn PDF document text
    • http://waldkindergarten-abensberg.de/images/minecraft-java-account-free_GM479516143.pdfIn PDF document text
    • http://waldkindergarten-abensberg.de/images/coin-master-daily-free-spins-link-facebook_GM406889139.pdfIn PDF document text
    • http://waldkindergarten-abensberg.de/images/legit-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://waldkindergarten-abensberg.de/images/how-to-get-more-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://waldkindergarten-abensberg.de/images/how-to-hack-coin-master-computer_GM406889139.pdfIn PDF document text
    • http://waldkindergarten-abensberg.de/images/free-hacks-for-coin-master_GM406889139.pdfIn PDF document text
    • http://waldkindergarten-abensberg.de/images/free-coin-master-cards_GM406889139.pdfIn PDF document text
    • http://waldkindergarten-abensberg.de/images/how-to-hack-a-minecraft-server-and-make-yourself-op_GM479516143.pdfIn PDF document text
    • http://waldkindergarten-abensberg.de/images/free-robux-now_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_003_off00004a35.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4A35 24668 bytes
SHA-256: 6b1c9b14d23b43546b4c5a895eb67064ece9ec33ad8d8dd317f83d448d634aa3
font_01_sfnt_off00008189.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8189 18136 bytes
SHA-256: 22c65de64af2721f6fc37241b86838ece151de043079d0e804f5da14bd34918b

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