Malicious PDF — malware analysis report

Static analysis result for SHA-256 26913fe25c2f4abd…

MALICIOUS

PDF

44.5 KB Created: 2021-05-16 09:01:38 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 400468f7b4c852dbf51b927a95b40baf SHA-1: 5a0b469801f55e94a16cf905ed78dd7e6fd27e47 SHA-256: 26913fe25c2f4abd1b162f2200ed19f951c1d8fbcf5cbac34021b1f7974a7fc0
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to known malicious redirectors and a 'free generator / game hack' lure, indicating a phishing or scam attempt. The document body and embedded URLs suggest the intent is to drive traffic to potentially malicious sites, likely for further exploitation or credential harvesting. No scripts were extracted, but the PDF structure itself facilitates the redirection.

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/479516143/mcpe-optifine-game-hack In PDF document text
    • http://oceanos.pl/images/how-to-o-get-free-coin-master-spins_GM406889139.pdfIn PDF document text
    • http://oceanos.pl/images/coin-master-game-free-play-online_GM406889139.pdfIn PDF document text
    • http://oceanos.pl/images/coin-master-free-items_GM406889139.pdfIn PDF document text
    • http://oceanos.pl/images/coin-master-hack-ios-download-2021_GM406889139.pdfIn PDF document text
    • http://oceanos.pl/images/free-spins-on-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://oceanos.pl/images/roblox-com-free-robux_GM431946152.pdfIn PDF document text
    • http://oceanos.pl/images/coin-master-hack-version-download_GM406889139.pdfIn PDF document text
    • http://oceanos.pl/images/free-hair-roblox_GM431946152.pdfIn PDF document text
    • http://oceanos.pl/images/today-free-spin-link-for-coin-master_GM406889139.pdfIn PDF document text
    • http://oceanos.pl/images/roblox-free-roblox_GM431946152.pdfIn PDF document text
    • http://oceanos.pl/images/orewards-com-free-robux_GM431946152.pdfIn PDF document text
    • http://oceanos.pl/images/coin-master-daily-free-spins-link-today-blog_GM406889139.pdfIn PDF document text
    • http://oceanos.pl/images/coin-master-hacks-no-downloading_GM406889139.pdfIn PDF document text
    • http://oceanos.pl/images/minecraft_GM479516143.pdfIn PDF document text
    • http://oceanos.pl/images/coin-master-free-link-spin_GM406889139.pdfIn PDF document text
    • http://oceanos.pl/images/easy-coin-master-hack-without-verification_GM406889139.pdfIn PDF document text
    • http://oceanos.pl/images/free-coin-and-spin-for-coin-master_GM406889139.pdfIn PDF document text
    • http://oceanos.pl/images/minecraft-pe-apk_GM479516143.pdfIn PDF document text
    • http://oceanos.pl/images/is-minecraft-free-on-switch_GM479516143.pdfIn PDF document text
    • http://oceanos.pl/images/how-to-get-free-robux-without-offers_GM431946152.pdfIn PDF document text
    • https://playhack.in/minecraftIn 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_off00004972.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4972 25808 bytes
SHA-256: 4c3263e44399cc0e05d07697deaa192380f6146644c8663df07f8fd9daa38ba3
font_01_sfnt_off000083d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x83D1 2892 bytes
SHA-256: c2578a292634a901613c1dd9f9883dd4930e6811e59ae03d696f263e56ea17b4
font_02_sfnt_off00008dba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8DBA 17516 bytes
SHA-256: 3222fce1ec24f9fe4c9c7187e94a50dcd616af103cb5e0df495c7ad715510956

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