Malicious PDF — malware analysis report

Static analysis result for SHA-256 88e23dfea4cecd5f…

MALICIOUS

PDF

46.4 KB Created: 2021-06-11 13:40:52 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 7ba1e4e7b05ec6c833a56e6bdce8ccfa SHA-1: 1c25c22b95af841888fa445b210f563e0ff95c16 SHA-256: 88e23dfea4cecd5fe452bae024c345c81d0b54ee57539b8458551795ae1206c6
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9832

Heuristics 5

  • 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.
  • PDF links to a 'free generator / game hack' redirector high 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.
  • 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
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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/hack-menu-exploit-script-roblox-pastebin-game-hack PDF link annotation
    • https://uofk.edu/images/how-to-get-free-hair-on-roblox_GM431946152.pdfIn PDF document text
    • https://uofk.edu/images/free-robux-apps-that-work_GM431946152.pdfIn PDF document text
    • https://uofk.edu/images/mocap-dancing-hack-roblox_GM431946152.pdfIn PDF document text
    • https://uofk.edu/images/haktuts-coin-master-free-spins-2021_GM406889139.pdfIn PDF document text
    • https://uofk.edu/images/coin-master-hack-no-survey_GM406889139.pdfIn PDF document text
    • https://uofk.edu/images/coin-master-hack-apk-april-12-2021_GM406889139.pdfIn PDF document text
    • https://uofk.edu/images/coin-master-hack-online-2021_GM406889139.pdfIn PDF document text
    • https://uofk.edu/images/coin-master-free-download-pc_GM406889139.pdfIn PDF document text
    • https://uofk.edu/images/how-to-hack-roblox-mad-city_GM431946152.pdfIn PDF document text
    • https://uofk.edu/images/roblox-hack-ios-jailbreak_GM431946152.pdfIn PDF document text
    • https://uofk.edu/images/how-to-get-free-robux-in-roblox-2021-may_GM431946152.pdfIn PDF document text
    • https://uofk.edu/images/roblox-noot-noot-hack-roblox-id_GM431946152.pdfIn PDF document text
    • https://uofk.edu/images/free-coin-master-link-2021_GM406889139.pdfIn PDF document text
    • https://uofk.edu/images/how-to-hack-injustice-roblox_GM431946152.pdfIn PDF document text
    • https://uofk.edu/images/how-to-get-free-coins-in-mcpe-master_GM406889139.pdfIn PDF document text
    • https://uofk.edu/images/coin-master-free-spins-link-2021-iphone_GM406889139.pdfIn PDF document text
    • https://uofk.edu/images/roblox-rules_GM431946152.pdfIn PDF document text
    • https://uofk.edu/images/how-to-hack-gta-car-game-on-roblox-mobile_GM431946152.pdfIn PDF document text
    • https://uofk.edu/images/free-robux-no-gift-card_GM431946152.pdfIn PDF document text
    • https://uofk.edu/images/how-to-hack-into-someones-roblox-account_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_off000051fe.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x51FE 27080 bytes
SHA-256: 268954c4befb45250b86badf2b0faf2fb90824143afaea4cc65d99882a7769af
font_01_sfnt_off0000909a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x909A 19072 bytes
SHA-256: 0a32d4fe2d6d95a12152ad10604b29f9ef46ae288c59c7b0f1513e282c3e30b5

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