Malicious PDF — malware analysis report

Static analysis result for SHA-256 9dbdceb6f789c99d…

MALICIOUS

PDF

46.5 KB Created: 2021-06-09 02:11:54 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-07
MD5: af546424b41a6e9dc750d52dfc771c2a SHA-1: d1e7f7c928ef50795ac836ee175774bd22359a2c SHA-256: 9dbdceb6f789c99d47d8becf5ed6584881d5ae05cb540910ecacbde2f318f1a3
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains embedded links that redirect to a "free Robux generator" lure, which is a common social engineering tactic. The primary link points to known malicious redirector infrastructure, indicating a probable attempt to lead the user to a malicious site or download. No scripts were extracted, but the presence of malicious links and the ML classifier's high confidence score support this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9832

Heuristics 4

  • 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.
  • 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-robux-generator-online-no-survey-no-human-verification-game-hack In PDF document text
    • https://unsla.uns.ac.id:443/pgsd/repository/https-iosgodscom-topic-20218flipmastercoinshack_GM406889139.pdfIn PDF document text
    • https://unsla.uns.ac.id:443/pgsd/repository/how-do-you-get-free-food-on-coin-master_GM406889139.pdfIn PDF document text
    • https://unsla.uns.ac.id:443/pgsd/repository/get-free-robux-now_GM431946152.pdfIn PDF document text
    • https://unsla.uns.ac.id:443/pgsd/repository/free-spins-coin-master-hack-2021_GM406889139.pdfIn PDF document text
    • https://unsla.uns.ac.id:443/pgsd/repository/give-me-free-robux_GM431946152.pdfIn PDF document text
    • https://unsla.uns.ac.id:443/pgsd/repository/get-free-gold-cards-in-coin-master_GM406889139.pdfIn PDF document text
    • https://unsla.uns.ac.id:443/pgsd/repository/free-coin-coin-master_GM406889139.pdfIn PDF document text
    • https://unsla.uns.ac.id:443/pgsd/repository/free-robux-app_GM431946152.pdfIn PDF document text
    • https://unsla.uns.ac.id:443/pgsd/repository/fbchampion-com_GM406889139.pdfIn PDF document text
    • https://unsla.uns.ac.id:443/pgsd/repository/free-spins-and-coins-from-coin-master-game_GM406889139.pdfIn PDF document text
    • https://unsla.uns.ac.id:443/pgsd/repository/is-minecraft-free-on-xbox_GM479516143.pdfIn PDF document text
    • https://unsla.uns.ac.id:443/pgsd/repository/free-robux-glitch_GM431946152.pdfIn PDF document text
    • https://unsla.uns.ac.id:443/pgsd/repository/cool-avatars-in-roblox-for-free_GM431946152.pdfIn PDF document text
    • https://unsla.uns.ac.id:443/pgsd/repository/coin-master-daily-free-spins-and-coins_GM406889139.pdfIn PDF document text
    • https://unsla.uns.ac.id:443/pgsd/repository/twitter-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • https://unsla.uns.ac.id:443/pgsd/repository/coin-master-hack-online-generator-without-human-verification_GM406889139.pdfIn PDF document text
    • https://unsla.uns.ac.id:443/pgsd/repository/hack-master-coin_GM406889139.pdfIn PDF document text
    • https://unsla.uns.ac.id:443/pgsd/repository/free-robux-no-human-verification-no-survey_GM431946152.pdfIn PDF document text
    • https://unsla.uns.ac.id:443/pgsd/repository/coin-master-free-spin-ml_GM406889139.pdfIn PDF document text
    • https://unsla.uns.ac.id:443/pgsd/repository/roblox-robux-hack_GM431946152.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
stream_004_off00005440.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5440 26616 bytes
SHA-256: 699ecb848a5a57b8997e61f211882d97f357234de3a0c6381316c1509fcd3767
font_01_sfnt_off0000909f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x909F 19228 bytes
SHA-256: 8a9defb9a2ee4b682813706c90ed5a9d7908c92db48bad3f2c1e93d655b79bc8

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