Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9f4edd6c9519791…

MALICIOUS

PDF

35.2 KB Created: 2021-06-22 09:53:40 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 602beb2a48705a7334d33103cb1289c1 SHA-1: 96bb556e847f3ae30175414c269b7b7be1b8b408 SHA-256: d9f4edd6c95197911ab90808dfbfa32f85eb4763dbfcbab8839845931e31e40c
220 Risk Score

Malware Insights

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

The PDF document contains numerous links designed to lure users into clicking on them, promising free in-game items or hacks. These links redirect to malicious infrastructure, including a known redirector and a large number of other PDF files hosted on dev.pmrscambodia.org, suggesting a link farm or SEO poisoning attack. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the primary attack pattern involves social engineering through deceptive content and redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://netcdn.co/app/431946152/how-to-get-free-hats-on-roblox-2021-game-hack In PDF document text
    • http://dev.pmrscambodia.org/images/uploadfiles/broward-county-roblox-free_GM431946152.pdfIn PDF document text
    • http://dev.pmrscambodia.org/images/uploadfiles/coin-master-unlimited-spin-hack-apk_GM406889139.pdfIn PDF document text
    • http://dev.pmrscambodia.org/images/uploadfiles/roblox-games-play-free-no-download_GM431946152.pdfIn PDF document text
    • http://dev.pmrscambodia.org/images/uploadfiles/what-to-do-if-your-roblox-account-is-hacked_GM431946152.pdfIn PDF document text
    • http://dev.pmrscambodia.org/images/uploadfiles/how-to-get-hacks-in-roblox-2021_GM431946152.pdfIn PDF document text
    • http://dev.pmrscambodia.org/images/uploadfiles/how-to-get-unlimited-robux_GM431946152.pdfIn PDF document text
    • http://dev.pmrscambodia.org/images/uploadfiles/moonactive-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://dev.pmrscambodia.org/images/uploadfiles/free-robux-for-sale_GM431946152.pdfIn PDF document text
    • http://dev.pmrscambodia.org/images/uploadfiles/how-to-hack-roblox-accounts-2021_GM431946152.pdfIn PDF document text
    • http://dev.pmrscambodia.org/images/uploadfiles/roblox-re_GM431946152.pdfIn PDF document text
    • http://dev.pmrscambodia.org/images/uploadfiles/how-to-get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://dev.pmrscambodia.org/images/uploadfiles/arianagrande-break-free-roblox-music-id_GM431946152.pdfIn PDF document text
    • http://dev.pmrscambodia.org/images/uploadfiles/free-coins-coin-master-spins_GM406889139.pdfIn PDF document text
    • http://dev.pmrscambodia.org/images/uploadfiles/coin-master-free-coins-link-facebook_GM406889139.pdfIn PDF document text
    • http://dev.pmrscambodia.org/images/uploadfiles/how-do-i-get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://dev.pmrscambodia.org/images/uploadfiles/free-robux-no-human-verification-no-survey_GM431946152.pdfIn PDF document text
    • http://dev.pmrscambodia.org/images/uploadfiles/free-robux-generator-no-verification-2021_GM431946152.pdfIn PDF document text
    • http://dev.pmrscambodia.org/images/uploadfiles/roblox-robux-codes-2021_GM431946152.pdfIn PDF document text
    • http://dev.pmrscambodia.org/images/uploadfiles/how-to-get-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • http://dev.pmrscambodia.org/images/uploadfiles/scaffold-minecraft-hack_GM479516143.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_002_off000031b8.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x31B8 22412 bytes
SHA-256: ad50b85b935b7a9ae38aa9861656c80787310668361a4f3b3343e436de7d22c3
font_01_sfnt_off0000637d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x637D 19320 bytes
SHA-256: 96f9b4ae0ddef397a93c0f32eb741b3d4413d6ad1c3ccb0b4b12c130eca8cf2e

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