Malicious PDF — malware analysis report

Static analysis result for SHA-256 3760f438633e7dbf…

MALICIOUS

PDF

42.5 KB Created: 2021-05-10 22:30:24 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 6568f574ce48812b845bf5dd592f0796 SHA-1: 5571093b2920d1af7300dddab51b73fb41fe63dd SHA-256: 3760f438633e7dbf0b1faf9f7580080e13bda1b03f49c3f7a3f43b0acbd1a347
240 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are identified as malicious redirectors or part of a link farm. The document body and heuristics indicate a lure for game hacks and free in-game currency, a common social engineering tactic. The malformed stream length suggests an attempt to hide malicious content, likely an exploit or further redirection mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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.
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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/431946152/roblox-fun-com-free-robux-game-hack In PDF document text
    • http://cintabaca.org/katalog//repository/coin-master-game-hack-apk_GM406889139.pdfIn PDF document text
    • http://cintabaca.org/katalog//repository/free-robux-generator-no-survey-no-download-no-human-verification_GM431946152.pdfIn PDF document text
    • http://cintabaca.org/katalog/repository/coin-master-link-daily-get-free-spins-amp_GM406889139.pdfIn PDF document text
    • http://cintabaca.org/katalog/repository/how-to-get-free-robux-hack_GM431946152.pdfIn PDF document text
    • http://cintabaca.org/katalog//repository/cool-free-roblox-outfits_GM431946152.pdfIn PDF document text
    • http://cintabaca.org/katalog/repository/coin-master-cheat-to-get-free-spins_GM406889139.pdfIn PDF document text
    • http://cintabaca.org/katalog/repository/how-to-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://cintabaca.org/katalog//repository/how-to-get-free-robux-by-playing-games_GM431946152.pdfIn PDF document text
    • http://cintabaca.org/katalog/repository/coin-master-haktuts_GM406889139.pdfIn PDF document text
    • http://cintabaca.org/katalog//repository/i-need-more-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://cintabaca.org/katalog//repository/how-to-hack-coins-in-archery-master-3d_GM406889139.pdfIn PDF document text
    • http://cintabaca.org/katalog//repository/free-robux-generator-without-verification_GM431946152.pdfIn PDF document text
    • http://cintabaca.org/katalog/repository/how-to-hack-roblox-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://cintabaca.org/katalog//repository/get-free-robux-com_GM431946152.pdfIn PDF document text
    • http://cintabaca.org/katalog//repository/win-free-robux_GM431946152.pdfIn PDF document text
    • http://cintabaca.org/katalog/repository/coin-master-free-spins-link-today-facebook_GM406889139.pdfIn PDF document text
    • http://cintabaca.org/katalog//repository/claim-free-robux-button_GM431946152.pdfIn PDF document text
    • http://cintabaca.org/katalog//repository/freespincoin-masterlinkdownload_GM406889139.pdfIn PDF document text
    • http://cintabaca.org/katalog//repository/free-daily-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://cintabaca.org/katalog/repository/free-coin-master-spins-daily_GM406889139.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_off00004a76.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4A76 25276 bytes
SHA-256: 5f61c4608ad44022fb8e6805f06e37d68e3bf551d4eb38e80fa815d4bff8b4fa
font_01_sfnt_off000083e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x83E8 18348 bytes
SHA-256: 9560f0e6f9a4e6be006083e3696e79311a38bb173f302534750988b281bae61f

Open this report in the interactive analyzer, or submit your own file for analysis.