Malicious PDF — malware analysis report

Static analysis result for SHA-256 47456c94e0188fd8…

MALICIOUS

PDF

44.4 KB Created: 2021-05-13 17:50:26 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 1efdcdf979a98ae58f773dabdc0cc1de SHA-1: b0823050e2f043b9b367e7c31825bd0e33ec27e7 SHA-256: 47456c94e0188fd844699120343dc183af6288611241ade3a32bd15be866786a
220 Risk Score

Malware Insights

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

This PDF document contains multiple links to known malicious redirectors and a link farm, suggesting a phishing or scam campaign. The primary lure appears to be related to 'game hacks' and 'free spins' for games like Pig Master and Coin Master. The document body, though partially corrupted, contains references to these lures and the authoring application, wkhtmltopdf. The presence of numerous external PDF links indicates an attempt to distribute further malicious content or engage in SEO manipulation for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9632

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/406889139/pig-master-coin-master-free-spin-game-hack In PDF document text
    • https://www.flexcable.com/images/coin-master-invite-friends-free-spins_GM406889139.pdfIn PDF document text
    • https://www.flexcable.com/images/coin-master-spin-hack-apk_GM406889139.pdfIn PDF document text
    • https://www.flexcable.com/images/best-free-minecraft-server-hosting_GM479516143.pdfIn PDF document text
    • https://www.flexcable.com/images/free-spin-coin-master-link-2021_GM406889139.pdfIn PDF document text
    • https://www.flexcable.com/images/how-to-get-free-robux-on-mobile_GM431946152.pdfIn PDF document text
    • https://www.flexcable.com/images/mcpe-master-hack-unlimited-coins-latest-version_GM406889139.pdfIn PDF document text
    • https://www.flexcable.com/images/how-do-i-get-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • https://www.flexcable.com/images/free-robux-no-anti-bot-verification_GM431946152.pdfIn PDF document text
    • https://www.flexcable.com/images/free-spins-on-coin-masters_GM406889139.pdfIn PDF document text
    • https://www.flexcable.com/images/robux-apk_GM431946152.pdfIn PDF document text
    • https://www.flexcable.com/images/free-robux-hack-no-human-verification_GM431946152.pdfIn PDF document text
    • https://www.flexcable.com/images/get-me-robux-for-free_GM431946152.pdfIn PDF document text
    • https://www.flexcable.com/images/how-to-get-free-robux-on-pc_GM431946152.pdfIn PDF document text
    • https://www.flexcable.com/images/free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://www.flexcable.com/images/como-hackear-coin-master-espaol_GM406889139.pdfIn PDF document text
    • https://www.flexcable.com/images/free-robux-redeem-codes_GM431946152.pdfIn PDF document text
    • https://www.flexcable.com/images/free-coin-master-spin-app_GM406889139.pdfIn PDF document text
    • https://www.flexcable.com/images/how-to-get-free-robux-on-roblox-2021_GM431946152.pdfIn PDF document text
    • https://www.flexcable.com/images/free-coins-for-coin-master_GM406889139.pdfIn PDF document text
    • https://www.flexcable.com/images/how-to-hack-someones-roblox-account_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
stream_003_off000048ba.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x48BA 24652 bytes
SHA-256: 4dacfe8e9222868c1690f1023c1f229d7d85dc7bb62086c6d9d53b6fe6dff67b
font_01_sfnt_off0000812c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x812C 2820 bytes
SHA-256: 96a70491b0783ad8c6fc9b11a18f021aa22c69ac41ee4499b781d16a1b99b689
font_02_sfnt_off00008acc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8ACC 18328 bytes
SHA-256: c0a64c35313388beafce2145b76a0bf40d6659a82da461cbcb21248082e95923