Malicious PDF — malware analysis report

Static analysis result for SHA-256 b93bc62bb75c1604…

MALICIOUS

PDF

44.2 KB Created: 2021-06-08 17:28:03 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-22
MD5: ee4b7f3099459d106d98b237848eef25 SHA-1: ded7e4b1070fb182618785ee0e36c4313c0da0cb SHA-256: b93bc62bb75c1604a1e5722d7db48b4b78e1e7e3734366b1321a8d4dfe3d269a
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to websites that appear to be part of a link farm or SEO manipulation scheme, promoting "game hacks" and "generators." One prominent URL, https://netcdn.tw/app/431946152/hire-someone-to-hack-a-roblox-account-game-hack, is flagged as a malicious redirector. The document's content and structure strongly suggest a lure to drive traffic to potentially malicious sites, likely for phishing or malware delivery, aligning with a spearphishing attachment attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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 https://netcdn.tw/app/431946152/hire-someone-to-hack-a-roblox-account-game-hack In PDF document text
    • https://library.sttbandung.ac.id/repository/robux-hack-no-human-verification_GM431946152.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/hacks-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/free-minecraft-gift-codes_GM479516143.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/install-free-game-coin-master_GM406889139.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/free-spins-coin-master-links_GM406889139.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/free-robux-generator_GM431946152.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/free-apk-mod-coin-master_GM406889139.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/how-to-get-free-robux-by-reporting_GM431946152.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/wurst-hacks_GM479516143.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/how-to-use-redstone_GM479516143.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/free-coin-master-gold-cards_GM406889139.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/free-robux-easy-and-fast_GM431946152.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/free-robux-instantly_GM431946152.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/coin-master-cracked-apk-free-download_GM406889139.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/pokemon-go-free-bundle_GM1094591345.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/roblox-hack-chaos-wacher_GM431946152.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/free-coin-master-spins-2021_GM406889139.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/free-robux-card-codes-unused_GM431946152.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/coin-master-hack-spin-ios_GM406889139.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/free-coin-master-hacks-no-verification_GM406889139.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_off00004dba.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4DBA 26144 bytes
SHA-256: 45d61d448412a852ed5856750dfb26e6a76469b29b9907c91b4c2ee9ffdab78b
font_01_sfnt_off00008899.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8899 18808 bytes
SHA-256: 845439299ae8a7057a621f8feb6336d7d73f8bb5770aad318d6636de16f3c460

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