Malicious PDF — malware analysis report

Static analysis result for SHA-256 5913d592f7f954f5…

MALICIOUS

PDF

35.0 KB Created: 2021-07-05 02:04:15 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-20
MD5: d02f1b033dc9c18b595b5b43ac441fbd SHA-1: 1365e1405322153f5841c56934b71f0cc7e235bf SHA-256: 5913d592f7f954f551b7fd4ef7e3a45ad06abacd519bcf956d539b2e704a7bd8
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document employs a common lure of free game currency and hacks to trick users into clicking malicious links. The document contains numerous links to SEO link farms and a primary redirector URL, indicating a phishing or scam campaign. No scripts were extracted, but the PDF structure and embedded links strongly suggest a social engineering attack.

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/406889139/coin-master-hack-unlimited-spins-game-download-game-hack In PDF document text
    • https://library.institutpendidikan.ac.id/repository/free-coin-master-spins-for-today_GM406889139.pdfIn PDF document text
    • https://library.institutpendidikan.ac.id/repository/roblox-2021-hack_GM431946152.pdfIn PDF document text
    • https://library.institutpendidikan.ac.id/repository/how-to-hack-a-minecraft-server_GM479516143.pdfIn PDF document text
    • https://library.institutpendidikan.ac.id/repository/coin-master-sound-daily-free-spins-link-today_GM406889139.pdfIn PDF document text
    • https://library.institutpendidikan.ac.id/repository/how-to-hack-group-funds-in-roblox_GM431946152.pdfIn PDF document text
    • https://library.institutpendidikan.ac.id/repository/free-2021-robux_GM431946152.pdfIn PDF document text
    • https://library.institutpendidikan.ac.id/repository/free-unused-activated-roblox-card-codes_GM431946152.pdfIn PDF document text
    • https://library.institutpendidikan.ac.id/repository/roblox-sonar-studios-dragon-adventures-cheats_GM431946152.pdfIn PDF document text
    • https://library.institutpendidikan.ac.id/repository/can-you-sell-shirts-for-free-in-roblox_GM431946152.pdfIn PDF document text
    • https://library.institutpendidikan.ac.id/repository/how-to-get-free-stuff-on-roblox-2021-mobile_GM431946152.pdfIn PDF document text
    • https://library.institutpendidikan.ac.id/repository/i-want-robux-for-free_GM431946152.pdfIn PDF document text
    • https://library.institutpendidikan.ac.id/repository/roblox-sex-hack-download_GM431946152.pdfIn PDF document text
    • https://library.institutpendidikan.ac.id/repository/free-minecraft-skins-xbox-one_GM479516143.pdfIn PDF document text
    • https://library.institutpendidikan.ac.id/repository/coin-master-free-coins-link-2021-today_GM406889139.pdfIn PDF document text
    • https://library.institutpendidikan.ac.id/repository/how-to-get-free-robux-without-paying_GM431946152.pdfIn PDF document text
    • https://library.institutpendidikan.ac.id/repository/cheat-codes-vip-roblox-id_GM431946152.pdfIn PDF document text
    • https://library.institutpendidikan.ac.id/repository/robux-hack-png_GM431946152.pdfIn PDF document text
    • https://library.institutpendidikan.ac.id/repository/coin-master-free-spins-link-2021-today_GM406889139.pdfIn PDF document text
    • https://library.institutpendidikan.ac.id/repository/coin-master-free-spins--coins-2021_GM406889139.pdfIn PDF document text
    • https://library.institutpendidikan.ac.id/repository/how-to-get-free-robux-in-2021_GM431946152.pdfIn PDF document text
    • https://www.urcouponsdeal.com/2019/03/coin-master-free-spin-and-coin-links.htmlIn 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_off00003171.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3171 22464 bytes
SHA-256: 06aa7186817fc503668a6115be9a70aeec81ffeb06fed4776d5c8915806e814d
font_01_sfnt_off00006335.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6335 19208 bytes
SHA-256: 9c8f838a0709b1a96b27bdca6a5ea38474ccbcef7ba8ec5b223b91ab2ea9a4ae

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