Malicious PDF — malware analysis report

Static analysis result for SHA-256 d917f1530f16539c…

MALICIOUS

PDF

47.2 KB Created: 2021-05-10 22:31:58 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 0fa09e1114f186288c082d94076b4729 SHA-1: 0fadccc9c6f07c60c82a79561858e6a30164776a SHA-256: d917f1530f16539c25e819f629fa1b04f98629f1376e397f62c2d6617f445c4a
200 Risk Score

Malware Insights

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

The PDF contains multiple heuristics indicating malicious redirector links and lures for game hacks, such as 'free robux'. The primary malicious URL identified is https://netcdn.xyz/app/431946152/free-robux-hack-generator-game-hack, which is flagged as a known malicious redirector. The document body, though partially corrupted, also contains references to 'Free Robux Hack Generator' and the same malicious URL, reinforcing the phishing and potential malware distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8948

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.
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not 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.xyz/app/431946152/free-robux-hack-generator-game-hack In PDF document text
    • http://digilib.stimata.ac.id/repository/free-robux-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://digilib.stimata.ac.id/repository/minecraft-pe-apk-download-free-015-0_GM479516143.pdfIn PDF document text
    • http://digilib.stimata.ac.id/repository/minecraft-svg-images-free_GM479516143.pdfIn PDF document text
    • http://digilib.stimata.ac.id/repository/free-2021-robux_GM431946152.pdfIn PDF document text
    • http://digilib.stimata.ac.id/repository/how-do-i-get-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • http://digilib.stimata.ac.id/repository/coin-master-free-spins-hack-no-human-verification_GM406889139.pdfIn PDF document text
    • http://digilib.stimata.ac.id/repository/minecraft-redeem-code-free_GM479516143.pdfIn PDF document text
    • http://digilib.stimata.ac.id/repository/give-free-robux_GM431946152.pdfIn PDF document text
    • http://digilib.stimata.ac.id/repository/free-roblox-website_GM431946152.pdfIn PDF document text
    • http://digilib.stimata.ac.id/repository/coin-master-free-2021-spin-link_GM406889139.pdfIn PDF document text
    • http://digilib.stimata.ac.id/repository/coin-master-spins-free-2021_GM406889139.pdfIn PDF document text
    • http://digilib.stimata.ac.id/repository/free-coin-master-spins-and-coins-for-daily_GM406889139.pdfIn PDF document text
    • http://digilib.stimata.ac.id/repository/claimrbx-free-robux_GM431946152.pdfIn PDF document text
    • http://digilib.stimata.ac.id/repository/free-robux-generator-for-kids_GM431946152.pdfIn PDF document text
    • http://digilib.stimata.ac.id/repository/aimbot-download-roblox_GM431946152.pdfIn PDF document text
    • http://digilib.stimata.ac.id/repository/unlimited-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://digilib.stimata.ac.id/repository/coin-master-free-spins-link_GM406889139.pdfIn PDF document text
    • http://digilib.stimata.ac.id/repository/roblox-hack-generator_GM431946152.pdfIn PDF document text
    • http://digilib.stimata.ac.id/repository/wwwhaktutsin-2021-08-coinmasterfreespinandcoinlinkhtml-m-1_GM406889139.pdfIn PDF document text
    • http://digilib.stimata.ac.id/repository/coin-master-free-cards_GM406889139.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_003_off00004c95.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4C95 25660 bytes
SHA-256: 42f8cd3777deb113f9119fac95bd43471590a6005a6f63603ab49f0f0a936043
font_01_sfnt_off0000881d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x881D 3988 bytes
SHA-256: 567b12258042b29dc9213b211e31194e9e0e96b59e87b0fcdaf4835989646dee
font_02_sfnt_off0000953c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x953C 18516 bytes
SHA-256: ac45002ee2c78c55a094f6344a5e95abe10f4ed7f4298fc77d5376065a98214b

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