Malicious PDF — malware analysis report

Static analysis result for SHA-256 df09fdeea373b184…

MALICIOUS

PDF

46.2 KB Created: 2021-05-12 05:38:13 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 43d25a31143b5ed48f5493d50196bfdf SHA-1: e545bf7d6ebc215aa50de109d33e364a442c0f7c SHA-256: df09fdeea373b1841d3a0fea62c3cfa05b23a18f522be1089125e5b7c8f0901a
240 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to external resources, including a known malicious redirector and raw IP addresses hosting seemingly unrelated PDF files. These links are presented as "free generators" or "game hacks," a common lure for phishing or malware distribution. The presence of a "download button" heuristic further supports the intent to trick users into downloading malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9432

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.
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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/how-to-download-minecraft-for-free-on-pc-game-hack In PDF document text
    • http://183.91.70.7/repository/how-to-get-free-roblox-gift-cards_GM431946152.pdfPDF link annotation
    • http://183.91.70.7//repository/can-lucky-patcher-hack-coin-master_GM406889139.pdfIn PDF document text
    • http://183.91.70.7//repository/roblox-printables-free_GM431946152.pdfIn PDF document text
    • http://183.91.70.7/repository/roblox-bux-free_GM431946152.pdfIn PDF document text
    • http://183.91.70.7//repository/robux-generator-without-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://183.91.70.7/repository/how-to-get-free-robux-for-free_GM431946152.pdfIn PDF document text
    • http://183.91.70.7/repository/more-robux_GM431946152.pdfIn PDF document text
    • http://183.91.70.7//repository/how-to-get-free-robux-easy-no-download_GM431946152.pdfIn PDF document text
    • http://183.91.70.7//repository/free-coins-coin-master-blog_GM406889139.pdfIn PDF document text
    • http://183.91.70.7/repository/free-robux-not-a-scam_GM431946152.pdfIn PDF document text
    • http://183.91.70.7//repository/coin-master-free-spin-today-2021_GM406889139.pdfIn PDF document text
    • http://183.91.70.7//repository/moonactive-free-spins_GM406889139.pdfIn PDF document text
    • http://183.91.70.7//repository/minecraft-app-store-free_GM479516143.pdfIn PDF document text
    • http://183.91.70.7/repository/hack-coin-master-apk-download_GM406889139.pdfIn PDF document text
    • http://183.91.70.7/repository/coin-master-hack-ios-2021_GM406889139.pdfIn PDF document text
    • http://183.91.70.7//repository/coin-master-attack-madness-hack_GM406889139.pdfIn PDF document text
    • http://183.91.70.7//repository/free-rewards-coin-master_GM406889139.pdfIn PDF document text
    • http://183.91.70.7/repository/free-coin-master-coins-and-spins_GM406889139.pdfIn PDF document text
    • http://183.91.70.7//repository/free-coins-on-coin-master-generator_GM406889139.pdfIn PDF document text
    • http://183.91.70.7/repository/play-minecraft-pocket-edition-for-free_GM479516143.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_off00004cf7.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4CF7 25944 bytes
SHA-256: b98c45346aafa084ba7fa3424c93000a216d638f348e5ab13f8390dbdee54007
font_01_sfnt_off000087e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x87E2 2880 bytes
SHA-256: 10d025f04f706eb71cdda4f99784df1b9ccb52e48080e43095e0398eaef6f132
font_02_sfnt_off000091cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x91CD 18444 bytes
SHA-256: 9e3148d8479467241e454dad7f95496d0753043299a483a1afd63e9d4426fe5d

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