Malicious PDF — malware analysis report

Static analysis result for SHA-256 646c4fff797cf9a7…

MALICIOUS

PDF

44.6 KB Created: 2021-05-13 19:49:11 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 980a764f8e51fac41b53b4dada190e31 SHA-1: 0f544c345f598d8ef0bf4a278bda1866865e49f8 SHA-256: 646c4fff797cf9a70d6d6709eee9646f41d3eba673b342c74264342132d0c7f1
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document employs a common lure of free game currency and hacks to trick users into clicking malicious links. It contains a primary link to a known malicious redirector and a large number of SEO-optimized PDF links hosted on aeridefense.com, likely leading to further malware or phishing content. The document body and heuristics strongly indicate a social engineering attack aimed at driving traffic to potentially harmful 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 https://netcdn.xyz/app/431946152/free-robux-without-doing-anything-game-hack In PDF document text
    • http://aeridefense.com/image/data/files/minecraft-free-download-android-apk_GM479516143.pdfIn PDF document text
    • http://aeridefense.com/image/data/files/roblox-gift-card-for-free_GM431946152.pdfIn PDF document text
    • http://aeridefense.com/image/data/files/how-to-get-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • http://aeridefense.com/image/data/files/coin-master-free-2021-spin-link_GM406889139.pdfIn PDF document text
    • http://aeridefense.com/image/data/files/free-spin-coin-master-game_GM406889139.pdfIn PDF document text
    • http://aeridefense.com/image/data/files/how-to-get-free-robux-2021-no-human-verification_GM431946152.pdfIn PDF document text
    • http://aeridefense.com/image/data/files/how-to-get-free-robux-on-roblox-2021_GM431946152.pdfIn PDF document text
    • http://aeridefense.com/image/data/files/free-coin-master-hacks_GM406889139.pdfIn PDF document text
    • http://aeridefense.com/image/data/files/best-free-spins-link-coin-master_GM406889139.pdfIn PDF document text
    • http://aeridefense.com/image/data/files/roblox-free-play_GM431946152.pdfIn PDF document text
    • http://aeridefense.com/image/data/files/how-to-get-minecraft-for-free-on-xbox-one_GM479516143.pdfIn PDF document text
    • http://aeridefense.com/image/data/files/free-coins-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://aeridefense.com/image/data/files/clean-master-free-coins-and-spins_GM406889139.pdfIn PDF document text
    • http://aeridefense.com/image/data/files/coin-master-free-spin-game_GM406889139.pdfIn PDF document text
    • http://aeridefense.com/image/data/files/coin-master-free-foxy-food_GM406889139.pdfIn PDF document text
    • http://aeridefense.com/image/data/files/coin-master-spin-link-today-2021_GM406889139.pdfIn PDF document text
    • http://aeridefense.com/image/data/files/roblox-person_GM431946152.pdfIn PDF document text
    • http://aeridefense.com/image/data/files/make-free-robux_GM431946152.pdfIn PDF document text
    • http://aeridefense.com/image/data/files/mc-hacks_GM479516143.pdfIn PDF document text
    • http://aeridefense.com/image/data/files/minecraft-svg-images-free_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_003_off0000482b.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x482B 28488 bytes
SHA-256: a6a59a351bd19c0b7759cc8ef5d870c02227836f53ff9b919579c0fcd8d4de72
font_01_sfnt_off00008955.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8955 19240 bytes
SHA-256: e1e4d521198b5ef2bb2d2ba3e061f6fd747e7988b39df69dcb6ecbaf810b6a5c

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