Malicious PDF — malware analysis report

Static analysis result for SHA-256 accf31e80669f180…

MALICIOUS

PDF

47.6 KB Created: 2021-06-08 21:05:41 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-15
MD5: df45c9347908fd4f8237473d764611fa SHA-1: 26c2b71c78cd0f395ce10e33d06ea4be7a1c999f SHA-256: accf31e80669f180155d712dcd46ea61c92708056685acb184d0e36ab3aab105
260 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains multiple links to known malicious redirectors and a link farm, disguised as game hacks and free item generators. The presence of a fake CAPTCHA lure suggests an attempt to trick users into further interaction, likely to download or execute additional malicious content. No scripts were extracted, but the overall structure and embedded URLs point to a common phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9769

Heuristics 6

  • 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.
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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/da-hood-hack-tuto-roblox-game-hack In PDF document text
    • http://arkivthy.dk/images/free-minecraft-windows-10-with-java_GM479516143.pdfIn PDF document text
    • http://arkivthy.dk/images/how-do-u-get-free-random-robux-on-roblox_GM431946152.pdfIn PDF document text
    • http://arkivthy.dk/images/free-spins-for-coin-master-app_GM406889139.pdfIn PDF document text
    • http://arkivthy.dk/images/free-robux-discord_GM431946152.pdfIn PDF document text
    • http://arkivthy.dk/images/how-to-get-roblox-clothes-free_GM431946152.pdfIn PDF document text
    • http://arkivthy.dk/images/free-tiktok-followers-no-human-verification-or-survey_GM835599320.pdfIn PDF document text
    • http://arkivthy.dk/images/free-minecraft-alts_GM479516143.pdfIn PDF document text
    • http://arkivthy.dk/images/coin-master-free-daily-spins-link_GM406889139.pdfIn PDF document text
    • http://arkivthy.dk/images/free-tiktok-views-no-verification_GM835599320.pdfIn PDF document text
    • http://arkivthy.dk/images/roblox-hack-me_GM431946152.pdfIn PDF document text
    • http://arkivthy.dk/images/free-robux-that-actually-works-2021_GM431946152.pdfIn PDF document text
    • http://arkivthy.dk/images/earn-free-robux-for-roblox_GM431946152.pdfIn PDF document text
    • http://arkivthy.dk/images/free-roblox-hack-us_GM431946152.pdfIn PDF document text
    • http://arkivthy.dk/images/coin-master-free-spins-generator-no-human-verification_GM406889139.pdfIn PDF document text
    • http://arkivthy.dk/images/how-to-get-free-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://arkivthy.dk/images/free-robux-generator-no-survey-no-download-no-human-verification_GM431946152.pdfIn PDF document text
    • http://arkivthy.dk/images/redeem-roblox-card-free_GM431946152.pdfIn PDF document text
    • http://arkivthy.dk/images/minecraft-story-mode-free_GM479516143.pdfIn PDF document text
    • http://arkivthy.dk/images/how-to-download-tiktok-free_GM835599320.pdfIn PDF document text
    • http://arkivthy.dk/images/how-do-i-get-free-spins-on-coin-master_GM406889139.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000051f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x51F6 25940 bytes
SHA-256: 5e9af0b8e69e407faa4e01894d269f939d217cf600d1705352b97536d303362e
font_01_sfnt_off00008bdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8BDB 2824 bytes
SHA-256: 94c1b019735d7e491765340abe50b2897410e2ec65ecf141c08bd9f2220897c4
font_02_sfnt_off00009589.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9589 18768 bytes
SHA-256: bcced340b897351f86a8ba208d5d433eb2caa964e7c18bf5fcca41bd1ad9c1b7

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