Malicious PDF — malware analysis report

Static analysis result for SHA-256 31b5a2d48331183a…

MALICIOUS

PDF

41.2 KB Created: 2021-05-11 16:01:26 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: f871ab91ad5a56837649cfeeff350d61 SHA-1: 9c3a92e1558c0530a853f5eec3c8de67dfa8b48d SHA-256: 31b5a2d48331183a55939123af302bb7cba9cb0d7f8219da55b3c625d477b185
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 0.9971

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 https://netcdn.xyz/app/406889139/coin-master-free-stuff-game-hack PDF link annotation
    • http://aspiesretreat.org/images/free-roblox-executor-no-key_GM431946152.pdfIn PDF document text
    • http://aspiesretreat.org/images/how-to-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://aspiesretreat.org/images/how-to-get-free-spins-grom-coin-master_GM406889139.pdfIn PDF document text
    • http://aspiesretreat.org/images/free-roblox-glasses_GM431946152.pdfIn PDF document text
    • http://aspiesretreat.org/images/how-to-get-free-spins-on-coin-master-android_GM406889139.pdfIn PDF document text
    • http://aspiesretreat.org/images/how-many-levels-are-in-coin-master_GM406889139.pdfIn PDF document text
    • http://aspiesretreat.org/images/free-to-play-minecraft-servers_GM479516143.pdfIn PDF document text
    • http://aspiesretreat.org/images/roblox-com-hack_GM431946152.pdfIn PDF document text
    • http://aspiesretreat.org/images/how-to-get-free-robux-hack_GM431946152.pdfIn PDF document text
    • http://aspiesretreat.org/images/wurst-hacked-client_GM479516143.pdfIn PDF document text
    • http://aspiesretreat.org/images/free-robux-2021-no-human-verification_GM431946152.pdfIn PDF document text
    • http://aspiesretreat.org/images/plug-toolbox-for-minecraft-free-ios_GM479516143.pdfIn PDF document text
    • http://aspiesretreat.org/images/earn-robux-for-roblox_GM431946152.pdfIn PDF document text
    • http://aspiesretreat.org/images/free-executors-for-roblox_GM431946152.pdfIn PDF document text
    • http://aspiesretreat.org/images/coin-master-free-spins-and-coins-without-human-verification_GM406889139.pdfIn PDF document text
    • http://aspiesretreat.org/images/robux-free-gift-card-org-hack_GM431946152.pdfIn PDF document text
    • http://aspiesretreat.org/images/roblox-free-clothes-hack_GM431946152.pdfIn PDF document text
    • http://aspiesretreat.org/images/free-robux-generator-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://aspiesretreat.org/images/free-printable-roblox-images_GM431946152.pdfIn PDF document text
    • http://aspiesretreat.org/images/how-to-earn-free-robux_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_003_off00004810.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4810 24552 bytes
SHA-256: d4c97f7c73f5764bdbef31caa9a0d49463264207c09b9f567c4aa4d777543f79
font_01_sfnt_off0000800b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x800B 17848 bytes
SHA-256: 49970788d519349fbd5ba6badf06c324563f4794a9a5c1e41d0627a31815ac32

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