Malicious PDF — malware analysis report

Static analysis result for SHA-256 4597aba4247bd532…

MALICIOUS

PDF

45.7 KB Created: 2021-06-03 10:04:52 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 50cf3c5ba1d66e7ee587418c1d23cb74 SHA-1: ff017911d9d3fd7ec51710a1b13bc10a18bd482c SHA-256: 4597aba4247bd532bed69966b0b9acf1401f6a607520888fe050fa8fc72a55fb
260 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links to external websites, including a primary redirector URL that is associated with malicious activity and impersonates the Amazon brand. The document body and heuristics indicate a lure for 'free Robux' or game hacks, designed to trick users into clicking malicious links. The presence of multiple PDF links suggests an attempt to create a link farm or SEO spam, further indicating a malicious intent to drive traffic to potentially harmful sites.

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.
  • Brand-impersonation credential phishing lure high SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: call-to-action link host does not match the impersonated brand: https://netcdn.online/app/431946152/free-robux-no-gift-card-game-hack.
  • 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/431946152/free-robux-no-gift-card-game-hack In PDF document text
    • https://library.sman1berau.sch.id/repository/free-robux-website_GM431946152.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/how-to-get-free-robux-without-surveys_GM431946152.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/how-do-you-get-free-robux-without-paying_GM431946152.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/coin-master-hack-cheat-generator-coins-and-spins-unlimited_GM406889139.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/how-to-create-a-minecraft-server-for-free_GM479516143.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/how-to-pubg-uc-free_GM1330123889.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/how-do-you-get-free-pet-food-in-coin-master_GM406889139.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/free-robux-easy_GM431946152.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/pokemon-go-joystick-free-download_GM1094591345.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-get-followers-on-tiktok-for-free_GM835599320.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/get-free-robux-now_GM431946152.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/coin-master-coins-free_GM406889139.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/coin-master-free-spins-link-2021-today_GM406889139.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/free-robux-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/free-coin-master-gifts_GM406889139.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/como-hackear-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/coin-master-3533-android-hack_GM406889139.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/haktuts-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/coin-master-free-daily-rewards_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_off000052c0.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x52C0 25972 bytes
SHA-256: 7542035b2e8b606fa0029cbbdd53d169c7178d6954ebe5e59cb5d81add228100
font_01_sfnt_off00008f1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8F1F 18640 bytes
SHA-256: 5e2a3e67d4e6faa48e47b93c69738121aad1fd6f7e815cfd3538255806571323

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