Malicious PDF — malware analysis report

Static analysis result for SHA-256 d899c472b0cf17f5…

MALICIOUS

PDF

33.4 KB Created: 2021-07-09 01:46:34 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-24
MD5: baf8df61c19cabf5037e3734c5f419ab SHA-1: 4c0065a58d0b1d020170cfe3343851a62579eb1d SHA-256: d899c472b0cf17f52f56137ecf660c870dca665d913a81c00d74cc4a474b5212
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to a malicious redirector, disguised as a 'game hack' generator. The document body and embedded links suggest a lure for free in-game currency or cheats, a common social engineering tactic. The presence of numerous links to external PDF files, many with numeric slugs, indicates a link farm designed to manipulate search engine results, likely to drive traffic to the malicious redirector.

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/431946152/how-to-hack-robux-game-hack In PDF document text
    • https://amiranet.com.br/files/files/roblox-broken-bones-hack_GM431946152.pdfIn PDF document text
    • https://amiranet.com.br/files/files/como-hackear-roblox-con-cheat-engine-robux_GM431946152.pdfIn PDF document text
    • https://amiranet.com.br/files/files/roblox-free-robux-codes-on-ipad_GM431946152.pdfIn PDF document text
    • https://amiranet.com.br/files/files/how-to-hack-roblox-accounts-with-edit-this-cookie_GM431946152.pdfIn PDF document text
    • https://amiranet.com.br/files/files/coin-master-connection-lost-hack_GM406889139.pdfIn PDF document text
    • https://amiranet.com.br/files/files/free-realistic-minecraft-texture-packs_GM479516143.pdfIn PDF document text
    • https://amiranet.com.br/files/files/minecraft-windows-10-edition-unlock-full-game-free_GM479516143.pdfIn PDF document text
    • https://amiranet.com.br/files/files/coin-master-free-link-2021_GM406889139.pdfIn PDF document text
    • https://amiranet.com.br/files/files/earn-free-robux-for-roblox_GM431946152.pdfIn PDF document text
    • https://amiranet.com.br/files/files/free-spins-and-coins-from-coin-master-game_GM406889139.pdfIn PDF document text
    • https://amiranet.com.br/files/files/tiktok-unlimited-free-trials_GM835599320.pdfIn PDF document text
    • https://amiranet.com.br/files/files/free-robux-not-a-scam_GM431946152.pdfIn PDF document text
    • https://amiranet.com.br/files/files/free-robux-real_GM431946152.pdfIn PDF document text
    • https://amiranet.com.br/files/files/can-you-hack-coin-master_GM406889139.pdfIn PDF document text
    • https://amiranet.com.br/files/files/free-coins-and-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://amiranet.com.br/files/files/coin-master-daily-free-spins-and-coins_GM406889139.pdfIn PDF document text
    • https://amiranet.com.br/files/files/free-roblox-mguis-site-v3rmillionnet_GM431946152.pdfIn PDF document text
    • https://amiranet.com.br/files/files/roblox-twisted-murderer-cheat-engine_GM431946152.pdfIn PDF document text
    • https://amiranet.com.br/files/files/marshmello-shirt-roblox-free_GM431946152.pdfIn PDF document text
    • https://amiranet.com.br/files/files/latest-coin-master-free-spins-link_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_off00002cc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2CC1 22040 bytes
SHA-256: 9b025df12e646ecd898c90af8171c567b05c5b659a761193472853f542fe4a46
font_01_sfnt_off00005daf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5DAF 18884 bytes
SHA-256: eabb09a914750731f64ad11a0b688188fe1798403d7ade495959fd69a4976413