Malicious PDF — malware analysis report

Static analysis result for SHA-256 440cb38daa844905…

MALICIOUS

PDF

33.6 KB Created: 2021-07-06 15:40:40 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 113fe76a6d97d2b407c970974ed1c9e6 SHA-1: 7a3bb36619f57915dfad14d303f43fcf965379bd SHA-256: 440cb38daa8449053e2394c083a2e992adb23df6df74b3969c03b56f6820df5d
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 what appear to be game hacks or generators for popular games. The primary link directs to a known malicious redirector, and the document body itself contains multiple SEO-optimized links to PDF files hosted on a university repository, likely part of a link farm. These tactics are commonly used to drive traffic to malicious sites or distribute further malware, aligning with a phishing or social engineering attack pattern.

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/835599320/tiktok-free-fans-game-hack In PDF document text
    • https://digilib.stikesindramayu.ac.id/repository/coinmaster-blogspot_GM406889139.pdfIn PDF document text
    • https://digilib.stikesindramayu.ac.id/repository/fb-coin-master-hack_GM406889139.pdfIn PDF document text
    • https://digilib.stikesindramayu.ac.id/repository/free-robux-no-survey-no-download-2021_GM431946152.pdfIn PDF document text
    • https://digilib.stikesindramayu.ac.id/repository/trucos-para-free-vip-ultimatesurvival-rpg-roblox_GM431946152.pdfIn PDF document text
    • https://digilib.stikesindramayu.ac.id/repository/how-to-get-free-coins-on-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://digilib.stikesindramayu.ac.id/repository/roblox-hack-robux-and-tix-cheat-tool_GM431946152.pdfIn PDF document text
    • https://digilib.stikesindramayu.ac.id/repository/how-to-get-free-robux-on-roblox-on-a-computer_GM431946152.pdfIn PDF document text
    • https://digilib.stikesindramayu.ac.id/repository/how-to-hack-roblox-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://digilib.stikesindramayu.ac.id/repository/how-to-download-hacks-for-roblox-jailbreak_GM431946152.pdfIn PDF document text
    • https://digilib.stikesindramayu.ac.id/repository/how-to-get-free-robux-easy-on-phone_GM431946152.pdfIn PDF document text
    • https://digilib.stikesindramayu.ac.id/repository/how-to-get-free-robux-easy-2021_GM431946152.pdfIn PDF document text
    • https://digilib.stikesindramayu.ac.id/repository/real-way-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://digilib.stikesindramayu.ac.id/repository/hacker-shirt-for-free-roblox_GM431946152.pdfIn PDF document text
    • https://digilib.stikesindramayu.ac.id/repository/hack-coin-master-apk-32-download_GM406889139.pdfIn PDF document text
    • https://digilib.stikesindramayu.ac.id/repository/hacker-told-me-a-promocode-that-gives-free-robux_GM431946152.pdfIn PDF document text
    • https://digilib.stikesindramayu.ac.id/repository/free-roblox-accounts-20212021_GM431946152.pdfIn PDF document text
    • https://digilib.stikesindramayu.ac.id/repository/free-robux-today_GM431946152.pdfIn PDF document text
    • https://digilib.stikesindramayu.ac.id/repository/how-to-get-free-permanent-robux_GM431946152.pdfIn PDF document text
    • https://digilib.stikesindramayu.ac.id/repository/roblox-phantom-forces-aimbot-free-download_GM431946152.pdfIn PDF document text
    • https://digilib.stikesindramayu.ac.id/repository/free-coins-and-spins-coin-master-2021_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_off0000303d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x303D 22240 bytes
SHA-256: 43d6c04bf61d97ac79d5f7e98ba85d1c1ed66b72da0ea56ac415cb8989f02c54
font_01_sfnt_off0000616e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x616E 17972 bytes
SHA-256: a5f800957f44f30c70d631c58a637c0d2b754c40d826217ca97998364650acb4

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