Malicious PDF — malware analysis report

Static analysis result for SHA-256 fdf81e85763cb6c5…

MALICIOUS

PDF

45.8 KB Created: 2021-06-09 06:40:33 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-16
MD5: d6f343a0b9457cc41f4b28d2de39af99 SHA-1: db54633278c596e29658f6cbf237054e2b765716 SHA-256: fdf81e85763cb6c5fc26cff69d6f984460253c5b478804f37034e5f73ac6c2eb
260 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains multiple links to known malicious redirectors and SEO link farms, disguised with lures like 'game hack' and 'free robux'. The document also displays a fake CAPTCHA, a common tactic to trick users into interacting with malicious content. While no scripts were directly extracted, the PDF structure and embedded links suggest an attempt to redirect the user to a malicious site, likely for further exploitation or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

Heuristics 6

  • 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.
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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/can-cheat-engine-hack-roblox-game-hack In PDF document text
    • https://library.sman1berau.sch.id/repository/can-i-get-free-robux_GM431946152.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/free-adidas-t-shirt-roblox_GM431946152.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/5-roblox-edit-this-cookie-hacks_GM431946152.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/minecraft-java-server-hosting-free_GM479516143.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/free-spins-coin-master-app_GM406889139.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/free-coin-master-spins-hack_GM406889139.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/how-to-make-a-minecraft-bedrock-server-for-free_GM479516143.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/oprewards-free-robux_GM431946152.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/how-to-minecraft-for-free_GM479516143.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/how-to-get-free-robux-and-tix-on-roblox-youtube_GM431946152.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/free-robux-accounts-2021_GM431946152.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/coin-master-card-collection-hack-2021_GM406889139.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/free-robux-crossed-out_GM431946152.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/coinmaster-com_GM406889139.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/how-to-get-free-robux-legit-2021_GM431946152.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/roblox-free-obc-generator_GM431946152.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/100-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/free-roblox-codes_GM431946152.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/real-robux-generator-2021_GM431946152.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/coin-master-free-coins-hack_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_off000051f2.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x51F2 27208 bytes
SHA-256: 9335a119ef30fff4a558329d1411a8ae6bb395cd5153433683e8b9684390b5ef
font_01_sfnt_off00008eed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8EED 18860 bytes
SHA-256: a0f30e5f13b7208b0de7b9549369effd1d8fc48d270f78c0a8add52374c2b331

Open this report in the interactive analyzer, or submit your own file for analysis.