Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c83fc87d2f19981…

MALICIOUS

PDF

32.3 KB Created: 2021-07-21 13:40:59 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-08-25
MD5: e293f3ee3ca1dbea11a746810aadfacb SHA-1: 7e2c8c96e56bb5d86c6b14c4dc96532d04fa79b8 SHA-256: 8c83fc87d2f19981a679a35f3f9bd1c326696c9dded1f4fd9c275d6f46a776b4
160 Risk Score

Malware Insights

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

This PDF document employs social engineering lures, promising free in-game currency or items to entice users to click on links. The primary link directs to a known malicious redirector, which in turn serves other malicious PDFs hosted on apotema.com.co. The document's structure and embedded links suggest an attempt to chain redirects, likely leading to further malicious content or exploits.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9900

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 http://netcdn.tw/app/835599320/free-tiktok-likes-trial-game-hack In PDF document text
    • http://apotema.com.co/ufiles/files/freer-pro-tiktok-fans_GM835599320.pdfIn PDF document text
    • http://apotema.com.co/ufiles/files/rbx-gg-free-robux_GM431946152.pdfIn PDF document text
    • http://apotema.com.co/ufiles/files/coin-master-free-stuff_GM406889139.pdfIn PDF document text
    • http://apotema.com.co/ufiles/files/free-spins-coin-master-app_GM406889139.pdfIn PDF document text
    • http://apotema.com.co/ufiles/files/free-minecraft-alts_GM479516143.pdfIn PDF document text
    • http://apotema.com.co/ufiles/files/free-tiktok-followers-no-human-verification_GM835599320.pdfIn PDF document text
    • http://apotema.com.co/ufiles/files/how-to-hack-roblox-games_GM431946152.pdfIn PDF document text
    • http://apotema.com.co/ufiles/files/minecraft-free-play-no-download_GM479516143.pdfIn PDF document text
    • http://apotema.com.co/ufiles/files/roblox-free-robux-hack_GM431946152.pdfIn PDF document text
    • http://apotema.com.co/ufiles/files/minecraft-for-ipad-free_GM479516143.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_002_off000029f2.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x29F2 23044 bytes
SHA-256: 7fd52d3ec32f957533f61e81c556baa85fc862580c71d0882c62fbf1f50f8732
font_01_sfnt_off00005df4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5DF4 17756 bytes
SHA-256: 9d76c6faa2ac5c2cb25d5c28859cdf9fe3589154660ff5d1bcb1376c3aae0ade