Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcd3627e54e7b66d…

MALICIOUS

PDF

43.8 KB Created: 2021-05-16 03:05:59 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-21
MD5: a48a6108e6d71dde9d3c813c296deff4 SHA-1: db06a7590fa8b2276e56b654012260b7d634537b SHA-256: dcd3627e54e7b66d43469891b167a061e3e0f4a29320485575cd970972cfd7d2
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document employs a lure of free Robux and game hacks to entice users to click on malicious links. The primary redirector URL leads to a page that further links to a large number of other PDF files, suggesting a link farm or a method to distribute further malicious content. The ML classifier strongly indicates maliciousness, and the presence of numerous external links points towards a phishing or scamming attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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.xyz/app/431946152/free-robux-no-anti-bot-verification-game-hack In PDF document text
    • http://schoolsupportandbeyond.org/images/coin-master-free-spins-april-2021_GM406889139.pdfIn PDF document text
    • http://schoolsupportandbeyond.org/images/coin-master-free-coins-2021_GM406889139.pdfIn PDF document text
    • http://schoolsupportandbeyond.org/images/hack-coin-master-for-android_GM406889139.pdfIn PDF document text
    • http://schoolsupportandbeyond.org/images/how-to-get-free-robux-on-mobile_GM431946152.pdfIn PDF document text
    • http://schoolsupportandbeyond.org/images/free-spins-coin-master-no-verification_GM406889139.pdfIn PDF document text
    • http://schoolsupportandbeyond.org/images/free-robux-giveaway-live_GM431946152.pdfIn PDF document text
    • http://schoolsupportandbeyond.org/images/free-robux-apps-that-work_GM431946152.pdfIn PDF document text
    • http://schoolsupportandbeyond.org/images/coin-master-hack-ios-2021_GM406889139.pdfIn PDF document text
    • http://schoolsupportandbeyond.org/images/minecraft-bedrock-edition-free-with-java_GM479516143.pdfIn PDF document text
    • http://schoolsupportandbeyond.org/images/minecraft-java-edition-redeem-code-free-2021_GM479516143.pdfIn PDF document text
    • http://schoolsupportandbeyond.org/images/free-robux-generator-2021_GM431946152.pdfIn PDF document text
    • http://schoolsupportandbeyond.org/images/how-to-get-free-robux-for-kids_GM431946152.pdfIn PDF document text
    • http://schoolsupportandbeyond.org/images/hack-coins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://schoolsupportandbeyond.org/images/free-spins-for-coin-master-game_GM406889139.pdfIn PDF document text
    • http://schoolsupportandbeyond.org/images/hack-coin-master-no-survey_GM406889139.pdfIn PDF document text
    • http://schoolsupportandbeyond.org/images/oprewards-free-robux_GM431946152.pdfIn PDF document text
    • http://schoolsupportandbeyond.org/images/free-minecraft-skins-pc_GM479516143.pdfIn PDF document text
    • http://schoolsupportandbeyond.org/images/free-coins-and-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://schoolsupportandbeyond.org/images/coin-master-free-spins-through-coin-pop_GM406889139.pdfIn PDF document text
    • http://schoolsupportandbeyond.org/images/free-robux-on-phone_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
stream_003_off000049aa.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x49AA 26224 bytes
SHA-256: 3591538f795e824ba4f4fb2dc4296f60b8c436d901ab48015761bdfc063ab81e
font_01_sfnt_off000087fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x87FD 18600 bytes
SHA-256: 8cfd8c2479ee29cd4f6dba9b0ab7f96f8a0f4a4bb194f6119df547073888af7b

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