Malicious PDF — malware analysis report

Static analysis result for SHA-256 a980dfc71abd1fe2…

MALICIOUS

PDF

34.8 KB Created: 2021-07-04 22:29:34 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 0f2b62267e4dd2b9eaad53564c1748ac SHA-1: abab32025a2079bbf893b8303b0647ac3ff7a9b1 SHA-256: a980dfc71abd1fe2447e4b56400d9c52c326e5479ae5120081aecedda931122c
142 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 5

  • 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.
  • PDF links to a 'free generator / game hack' redirector high 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.
  • 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
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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/406889139/coin-master-claim-free-spins-game-hack PDF link annotation
    • http://library.acehresearch.org/repository/minecraft-server-free-trial_GM479516143.pdfIn PDF document text
    • http://library.acehresearch.org/repository/wanna-join-my-free-giftcard-giveaway-roblox-iud_GM431946152.pdfIn PDF document text
    • http://library.acehresearch.org/repository/como-tener-robux-gratis-sin-hacks-ni-inspeccionar_GM431946152.pdfIn PDF document text
    • http://library.acehresearch.org/repository/free-spin-and-win-coin-master_GM406889139.pdfIn PDF document text
    • http://library.acehresearch.org/repository/how-to-get-roblox-hacks-on-mac_GM431946152.pdfIn PDF document text
    • http://library.acehresearch.org/repository/coin-master-hacks-and-cheats_GM406889139.pdfIn PDF document text
    • http://library.acehresearch.org/repository/free-robux-legit_GM431946152.pdfIn PDF document text
    • http://library.acehresearch.org/repository/how-to-get-free-roblox-money_GM431946152.pdfIn PDF document text
    • http://library.acehresearch.org/repository/good-unifrom-making-software-free-roblox_GM431946152.pdfIn PDF document text
    • http://library.acehresearch.org/repository/free-spins-coin-master-links_GM406889139.pdfIn PDF document text
    • http://library.acehresearch.org/repository/worst-client_GM479516143.pdfIn PDF document text
    • http://library.acehresearch.org/repository/minecraft-free-unblocked_GM479516143.pdfIn PDF document text
    • http://library.acehresearch.org/repository/speed-hacks-on-fangs-roblox-with-out-cheat-engins_GM431946152.pdfIn PDF document text
    • http://library.acehresearch.org/repository/coin-master-free-spin-daily-link_GM406889139.pdfIn PDF document text
    • http://library.acehresearch.org/repository/roblox-got-talent-hack_GM431946152.pdfIn PDF document text
    • http://library.acehresearch.org/repository/spin-coin-master-free_GM406889139.pdfIn PDF document text
    • http://library.acehresearch.org/repository/how-to-hack-roblox-flood-escape-2_GM431946152.pdfIn PDF document text
    • http://library.acehresearch.org/repository/minecraft-bedrock-edition-free_GM479516143.pdfIn PDF document text
    • http://library.acehresearch.org/repository/freespinandcoinblogspot-com-2021-11-coinmasterfreespins_GM406889139.pdfIn PDF document text
    • http://library.acehresearch.org/repository/how-to-get-free-robux-bc-only_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off000030a2.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x30A2 23148 bytes
SHA-256: 5f31b09698a85c7b9443f6a17e92ff77845fcdc03136f6dad1bb25d32f69b358
font_01_sfnt_off000064ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x64AC 18508 bytes
SHA-256: 1abd1480299989abb1f48682f677ba61eec9d98677dd9594eb02aefabe69620b

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