Malicious PDF — malware analysis report

Static analysis result for SHA-256 9bf9ffe3d1b232e4…

MALICIOUS

PDF

34.8 KB Created: 2021-06-23 10:35:05 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 16ac3c8780c3b21961030fe57ba0c988 SHA-1: 69dff42768899aac1032b27e2a9f8cb5eddecf55 SHA-256: 9bf9ffe3d1b232e4aadff686c485ca7fb6967b7c1adb0ee0af77880b97b6131b
220 Risk Score

Malware Insights

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

This PDF document employs a lure of free game currency and hacks to entice users into clicking malicious links. The primary link directs to a known malicious redirector infrastructure, which likely serves as a gateway to further malicious content or phishing pages. The document also contains a large number of SEO-optimized links pointing to other PDF files, suggesting a link farm or content spamming operation designed to attract traffic.

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.co/app/431946152/how-do-you-get-free-robux-on-your-phone-game-hack In PDF document text
    • https://opac.umrah.ac.id/repository/admin-cheats-for-roblox_GM431946152.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/cheat-roblox-cb-r-download_GM431946152.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/roblox-walking-through-wall-hacks_GM431946152.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/coin-master-free-cards-link_GM406889139.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/minecraft-xbox-360-free-download-code_GM479516143.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/how-to-get-free-robux-generator_GM431946152.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/code-hack-examiner-element-forum-roblox_GM431946152.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/free-coin-master-hack-no-verification_GM406889139.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/robux-now_GM431946152.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/free-robux-trusted_GM431946152.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/mad-factor-mad-city-hack-roblox_GM431946152.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/get-500-free-robux_GM431946152.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/free-spins-for-coin-master-on-1-19-19_GM406889139.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/free-robux-codes-2021-for-phone_GM431946152.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/how-to-play-coin-master_GM406889139.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/breaking-free-roblox-id_GM431946152.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/coin-master-free-spins-2021-ios_GM406889139.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/coin-master-free-spins-link-blogspot_GM406889139.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/minecraft-bedrock-free-download-pc_GM479516143.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/free-robux-codes-no-survey-no-download_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
font_00_sfnt_off00002efa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2EFA 22568 bytes
SHA-256: 27096e05e7872a2c9d2c1b119a73017db176f07fe468ee6006900b7114011089
font_01_sfnt_off00006149.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6149 19636 bytes
SHA-256: 04682890e41ecfd19a71dcbf49d7fd4fcdbfb78edf28c605d444781287852571

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