Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e1aebab1a969cbe…

MALICIOUS

PDF

35.6 KB Created: 2021-07-08 05:43:37 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 19c979542e41213b69fff667c8d677d8 SHA-1: 3abe247ff38bd86339a945e0f9bfe9ea63eaf218 SHA-256: 2e1aebab1a969cbe0b3669da18fa5e074f94461a48dbedb012a712d53ab47d66
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links designed to lure users into clicking on them by promising free game currency or hacks. These links lead to redirectors and a large number of SEO-optimized PDF files hosted on link farms, indicating a phishing or scam campaign. The document body and heuristics confirm the malicious redirection and link farm activity.

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 http://netcdn.tw/app/431946152/how-to-get-free-robux-no-human-verification-2021-game-hack In PDF document text
    • http://oca.undil.tl/repository/hacked-roblox-accounts-list_GM431946152.pdfIn PDF document text
    • http://oca.undil.tl/repository/coin-master-free-spin-download_GM406889139.pdfIn PDF document text
    • http://oca.undil.tl/repository/coin-master-free-coins-and-spins-today_GM406889139.pdfIn PDF document text
    • http://oca.undil.tl/repository/coin-master-hack-https-coinms-net_GM406889139.pdfIn PDF document text
    • http://oca.undil.tl/repository/coin-master-hack-tool-2021_GM406889139.pdfIn PDF document text
    • http://oca.undil.tl/repository/coin-master-free-spin-today_GM406889139.pdfIn PDF document text
    • http://oca.undil.tl/repository/roblox-games-with-free-radio_GM431946152.pdfIn PDF document text
    • http://oca.undil.tl/repository/give-me-robux_GM431946152.pdfIn PDF document text
    • http://oca.undil.tl/repository/coin-master-play-online-free_GM406889139.pdfIn PDF document text
    • http://oca.undil.tl/repository/free-robux-generator-no-survey-no-download-no-human-verification_GM431946152.pdfIn PDF document text
    • http://oca.undil.tl/repository/easy-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://oca.undil.tl/repository/street-fighting-simulator-infinity-stat-hack-roblox_GM431946152.pdfIn PDF document text
    • http://oca.undil.tl/repository/minecraft-pocket-edition-free-ios_GM479516143.pdfIn PDF document text
    • http://oca.undil.tl/repository/cm-daily-spins_GM406889139.pdfIn PDF document text
    • http://oca.undil.tl/repository/minecraft-nintendo-switch-digital-code-free_GM479516143.pdfIn PDF document text
    • http://oca.undil.tl/repository/free-roblox-accessories_GM431946152.pdfIn PDF document text
    • http://oca.undil.tl/repository/roblox-how-to-upload-custom-thumbnails-for-free_GM431946152.pdfIn PDF document text
    • http://oca.undil.tl/repository/how-to-get-free-food-on-coin-master_GM406889139.pdfIn PDF document text
    • http://oca.undil.tl/repository/coin-master-100-spin-slot_GM406889139.pdfIn PDF document text
    • http://oca.undil.tl/repository/coin-master-free-spins-2021-generator_GM406889139.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
font_00_sfnt_off000031a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x31A8 22396 bytes
SHA-256: dbe56c59c50ccf63b7e6a1264a93eb8abd7be2cd6bfd9bd2a5ec9f172fb0632c
font_01_sfnt_off00006383.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6383 19900 bytes
SHA-256: 071133fbd72890720303c8ecaa5d80d0b8671e9ee25b91c9a58bd6e8411eacd6

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