Malicious PDF — malware analysis report

Static analysis result for SHA-256 71ca394a654dff0e…

MALICIOUS

PDF

48.7 KB Created: 2021-06-09 11:40:28 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: c65b9471039df7c3b8e9f7af2ee238bf SHA-1: 6a31c1f62c6bc8adcabc2edcaafefc877ee11cc0 SHA-256: 71ca394a654dff0e56d701a6cffbf6c86cba84576ec30a634185b3c4ed37d9ad
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to websites that are flagged as malicious redirectors, specifically advertising game hacks and free currency. The ML classifier also strongly indicated maliciousness. While no scripts were extracted, the embedded URLs and the nature of the lures suggest the document is designed to lead the user to potentially harmful content or further malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9725

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/how-to-put-hacks-on-roblox-game-hack In PDF document text
    • https://tena-g.hr/files/minecraft-story-mode-free-download_GM479516143.pdfIn PDF document text
    • https://tena-g.hr/files/free-robux-cards_GM431946152.pdfIn PDF document text
    • https://www.tena-g.hr/files/coin-master-spin-link-free-download_GM406889139.pdfIn PDF document text
    • https://www.tena-g.hr/files/minecraft-115-2-hacks_GM479516143.pdfIn PDF document text
    • https://tena-g.hr/files/coinmasterhack-club_GM406889139.pdfIn PDF document text
    • https://www.tena-g.hr/files/free-skin-strucid-roblox_GM431946152.pdfIn PDF document text
    • https://www.tena-g.hr/files/no-verification-coin-master-hack_GM406889139.pdfIn PDF document text
    • https://tena-g.hr/files/new-roblox-jailbreak-hack-exploit-walkspeed-noclip-gravity-and-more_GM431946152.pdfIn PDF document text
    • https://tena-g.hr/files/coin-master-free-cards-link-2021_GM406889139.pdfIn PDF document text
    • https://www.tena-g.hr/files/legit-coin-master-hack-october-2021_GM406889139.pdfIn PDF document text
    • https://tena-g.hr/files/how-to-get-free-robux-without-downloading-anything_GM431946152.pdfIn PDF document text
    • https://www.tena-g.hr/files/coin-master-hack-apk-download-for-android-mobile_GM406889139.pdfIn PDF document text
    • https://tena-g.hr/files/free-coins-and-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://tena-g.hr/files/how-to-hack-digimon-aurity-roblox_GM431946152.pdfIn PDF document text
    • https://tena-g.hr/files/minecraft-free-download-no-virus_GM479516143.pdfIn PDF document text
    • https://www.tena-g.hr/files/can-i-download-minecraft-for-free_GM479516143.pdfIn PDF document text
    • https://tena-g.hr/files/roblox-pink-free-robux_GM431946152.pdfIn PDF document text
    • https://tena-g.hr/files/get-roebucks-com_GM431946152.pdfIn PDF document text
    • https://tena-g.hr/files/roblox-devil_GM431946152.pdfIn PDF document text
    • https://tena-g.hr/files/free-roblox-outfits_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000050b1.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x50B1 25824 bytes
SHA-256: 5194ad1a0a36e5acc2f5c923013e909c876efa89ad58d794a33be9a70ccc015b
font_01_sfnt_off00008cdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8CDC 5696 bytes
SHA-256: 450e3ee45915afe13702bf1d587eb8b9ad88a8d2113419ac9f2fd116a828e139
font_02_sfnt_off000099ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x99EE 18744 bytes
SHA-256: a0675b3c66407d241cfddd1d45db2e42d7aae23b7b80f7fb20408769bc659ebf