Malicious PDF — malware analysis report

Static analysis result for SHA-256 671c98c9795122fa…

MALICIOUS

PDF

50.3 KB Created: 2021-06-09 08:23:56 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 0c6164469f054e19a9949fb69110b5b6 SHA-1: 0eb773f50fce68bf30fb9a688bb41b1ece1e42e0 SHA-256: 671c98c9795122fac1b4ba9f4feafe4e25df6dbf3480b9681b2146b91e8aa4ad
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external sites, many of which are SEO-optimized PDF files related to game hacks and free currency. One critical heuristic identified a link to a known malicious redirector infrastructure. The document body, though heavily obfuscated, contains a URL that aligns with the lure of free game accounts and hacks, suggesting a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9734

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/free-accounts-on-roblox-discord-game-hack In PDF document text
    • http://lib-smansumsel.sch.id/repository/minecraft-hack-client-18-9_GM479516143.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/link-for-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/free-roblox-hack-us_GM431946152.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/coin-master-hack-tool-ios_GM406889139.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/get-me-robux-for-free_GM431946152.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/roblox-fun-com-free-robux_GM431946152.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/today-free-spin-coin-master_GM406889139.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/coin-master-card-hack-apk_GM406889139.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/claimrobux-net_GM431946152.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/roblox-com-www_GM431946152.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/freerobuxhack-us-2021_GM431946152.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/getrobux-now_GM431946152.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/free-premium-roblox_GM431946152.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/how-to-get-tiktok-followers-free_GM835599320.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/how-do-u-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/free-robux-no-gift-card_GM431946152.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/coin-master-free-spin-app-iphone_GM406889139.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/coin-master-free-blogspot_GM406889139.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/coin-master-free-link-blogspot_GM406889139.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/how-do-i-get-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00004da5.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4DA5 25508 bytes
SHA-256: 19eccf0fb28f739f58926f8bcc1f376ce96f8862f67a120866af8805ecd01969
font_01_sfnt_off000086a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x86A8 3884 bytes
SHA-256: 40b61f8938bd710dc29dc58ba3fde91c245a6a69596ec569b4d27c769ca417cf
font_02_sfnt_off0000934b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x934B 5696 bytes
SHA-256: 450e3ee45915afe13702bf1d587eb8b9ad88a8d2113419ac9f2fd116a828e139
font_03_sfnt_off0000a05d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA05D 18656 bytes
SHA-256: 8cfae63ec8b17e70500e83bc7f85cd9b587477db621701690551d6f8cff01bcc

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