Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c75e1bc1e1bc699…

MALICIOUS

PDF

46.5 KB Created: 2021-06-03 22:52:46 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-27
MD5: de37eb8f05521d1eaa6069e6a9266f5c SHA-1: 426d85d2a9aca60dda7d9ce3f6f4d5d3eab3eb0a SHA-256: 5c75e1bc1e1bc6997c30f45ad943882c50532a1050c32ecb09f2687ff56359c4
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document employs a lure of free game currency and hacks to trick users into clicking malicious links. It contains numerous links to redirector infrastructure and a link farm, suggesting an attempt to drive traffic to potentially malicious sites. The document body and embedded links strongly indicate a phishing or scamming attempt, likely leveraging a spearphishing attachment vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9748

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.online/app/406889139/coin-master-free-spins-link-2021-april-game-hack In PDF document text
    • http://library.itekes-bali.ac.id/repository/coin-master-free-spins-link-2021_GM406889139.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/how-do-u-get-free-robux_GM431946152.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/free-coins-and-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/best-way-to-hack-coin-master_GM406889139.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/coin-master-free-coins-and-spins-daily_GM406889139.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/coin-master-free-spin-and-coins-links_GM406889139.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/free-diamonds-coin-master_GM406889139.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/minecraft-anarchy-server-no-hacks_GM479516143.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/is-it-possible-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/free-roblox-clothes-and-hair_GM431946152.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/pubg-uc-voucher_GM1330123889.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/coin-master-free-attack-link_GM406889139.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/play-minecraft-online-free_GM479516143.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/how-to-download-tiktok-free_GM835599320.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/how-many-levels-does-coin-master-have_GM406889139.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/roblox36com-free-robux_GM431946152.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/make-free-robux_GM431946152.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/minecraft-hacked-client-112-2_GM479516143.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/free-roblox-hack_GM431946152.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/minecraft-hack-2021_GM479516143.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_004_off0000504d.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x504D 24644 bytes
SHA-256: c2be90c75ea76d21d45ad8f08319c16e8d87ec210219d69731f0a465d8a71c8b
font_01_sfnt_off00008808.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8808 2880 bytes
SHA-256: b053084cafd01c649462d87667ba56c569d6480ce60e7d20ae57ef6124cf178e
font_02_sfnt_off000091f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x91F3 18532 bytes
SHA-256: 552a781c635be2f1783b3430facdc17a6d9e208cae7d98c52d6673c33e385b16

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