Malicious PDF — malware analysis report

Static analysis result for SHA-256 ebde76f3fe6ce4ad…

MALICIOUS

PDF

46.3 KB Created: 2021-06-07 14:13:24 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-08-25
MD5: af26cc0b1b96e776bd93fee595bd2696 SHA-1: 560d9a791afa0182989ed71d5a6a9d8a431e4256 SHA-256: ebde76f3fe6ce4ad9a328f3e9be08345e8f74bf323935d59a3716144684b1dac
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple heuristics indicating malicious redirector links and a lure for game hacks, specifically pointing to the URL https://netcdn.tw/app/431946152/rich-account-password-free-robux-included-game-hack. The document body, though partially corrupted, also contains references to 'free Robux' and 'game hack', reinforcing the lure. The presence of embedded URLs and the nature of the lures suggest an attempt to trick users into visiting malicious sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9832

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.tw/app/431946152/rich-account-password-free-robux-included-game-hack In PDF document text
    • http://force-seniorklub.dk/images/pokemon-go-free-quagsire_GM1094591345.pdfIn PDF document text
    • http://force-seniorklub.dk/images/how-to-make-a-free-minecraft-account_GM479516143.pdfIn PDF document text
    • http://force-seniorklub.dk/images/free-robux-hack_GM431946152.pdfIn PDF document text
    • http://force-seniorklub.dk/images/coin-master-hack-uk_GM406889139.pdfIn PDF document text
    • http://force-seniorklub.dk/images/how-to-create-group-in-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://force-seniorklub.dk/images/free-spins-coin-master-generator_GM406889139.pdfIn PDF document text
    • http://force-seniorklub.dk/images/coin-master-hack-no-verification-no-signup_GM406889139.pdfIn PDF document text
    • http://force-seniorklub.dk/images/free-roblox-executor-no-key_GM431946152.pdfIn PDF document text
    • http://force-seniorklub.dk/images/get-free-food-in-coin-master_GM406889139.pdfIn PDF document text
    • http://force-seniorklub.dk/images/coin-master-spin-hack-2021_GM406889139.pdfIn PDF document text
    • http://force-seniorklub.dk/images/coin-master-free-spins-link-2021-haktuts_GM406889139.pdfIn PDF document text
    • http://force-seniorklub.dk/images/tiktok-free-gallery_GM835599320.pdfIn PDF document text
    • http://force-seniorklub.dk/images/how-to-get-20210-robux-for-free_GM431946152.pdfIn PDF document text
    • http://force-seniorklub.dk/images/coin-master-free-spons-apk-2021_GM406889139.pdfIn PDF document text
    • http://force-seniorklub.dk/images/coin-master-hack-spin-generator-tool_GM406889139.pdfIn PDF document text
    • http://force-seniorklub.dk/images/free-robux-no-password_GM431946152.pdfIn PDF document text
    • http://force-seniorklub.dk/images/coin-master-free-spins-cheat_GM406889139.pdfIn PDF document text
    • http://force-seniorklub.dk/images/free-daily-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://force-seniorklub.dk/images/coin-master-free-spins-link-no-verification-code_GM406889139.pdfIn PDF document text
    • http://force-seniorklub.dk/images/roblox-arsenal-hacks-download_GM431946152.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_004_off000051cd.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x51CD 26868 bytes
SHA-256: f85d45cb3b6aba5cf4b427c8f2e22cfb288375fedd9f3bb14f0befa2f63ec2b2
font_01_sfnt_off00008fe0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8FE0 19196 bytes
SHA-256: 6fcba8f26e2bea82345ced4ffcad0971712667764d06f6df2afe43c527e38502

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