Malicious PDF — malware analysis report

Static analysis result for SHA-256 219bc4fb5e674779…

MALICIOUS

PDF

48.3 KB Created: 2021-06-09 14:19:18 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 4e666d8d8d7cbbd28462de849828d129 SHA-1: c59b35f3769971c673d92bee54170a79a3daefff SHA-256: 219bc4fb5e6747794ef9ba66900225e4a0b6e148a4ed1a03caab5e2e1322d1ca
200 Risk Score

Malware Insights

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

This PDF file contains numerous embedded links, many of which point to a link farm designed to host various game-related cheat or hack PDFs. One critical heuristic identified a link to known malicious redirector infrastructure, and another flagged it as a brand-impersonation credential phishing lure, specifically impersonating Facebook. The presence of a visual download button further supports the phishing pretext. While no scripts were explicitly extracted, the PDF structure itself facilitates the malicious redirection and phishing attempts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9796

Heuristics 5

  • 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.tw/app/431946152/roblox-salty-kid-thinks-i.
  • 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/roblox-salty-kid-thinks-i In PDF document text
    • http://perpus.poltekeskupang.ac.id/repository/free-minecraft-games-for-kids_GM479516143.pdfIn PDF document text
    • http://perpus.poltekeskupang.ac.id/repository/how-to-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://perpus.poltekeskupang.ac.id/repository/how-to-make-free-robux_GM431946152.pdfIn PDF document text
    • http://perpus.poltekeskupang.ac.id/repository/how-do-you-earn-free-coins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://perpus.poltekeskupang.ac.id/repository/get-free-spins-on-coin-master-links_GM406889139.pdfIn PDF document text
    • http://perpus.poltekeskupang.ac.id//repository/robux-free-gift-card_GM431946152.pdfIn PDF document text
    • http://perpus.poltekeskupang.ac.id/repository/coin-master-daily-free-spins-2021_GM406889139.pdfIn PDF document text
    • http://perpus.poltekeskupang.ac.id/repository/free-coin-master-spins-links-2021_GM406889139.pdfIn PDF document text
    • http://perpus.poltekeskupang.ac.id/repository/free-coins-coin-master-haktuts_GM406889139.pdfIn PDF document text
    • http://perpus.poltekeskupang.ac.id/repository/pokemon-go-free-app_GM1094591345.pdfIn PDF document text
    • http://perpus.poltekeskupang.ac.id/repository/how-to-get-free-robux-without-email_GM431946152.pdfIn PDF document text
    • http://perpus.poltekeskupang.ac.id/repository/coin-master-free-spins-and-coins-link-today_GM406889139.pdfIn PDF document text
    • http://perpus.poltekeskupang.ac.id/repository/robux-earner_GM431946152.pdfIn PDF document text
    • http://perpus.poltekeskupang.ac.id//repository/coin-master-map_GM406889139.pdfIn PDF document text
    • http://perpus.poltekeskupang.ac.id/repository/coin-master-spin-hack-2021_GM406889139.pdfIn PDF document text
    • http://perpus.poltekeskupang.ac.id/repository/free-robux-site_GM431946152.pdfIn PDF document text
    • http://perpus.poltekeskupang.ac.id//repository/free-pet-food-for-coin-master_GM406889139.pdfIn PDF document text
    • http://perpus.poltekeskupang.ac.id//repository/cute-free-roblox-clothes_GM431946152.pdfIn PDF document text
    • http://perpus.poltekeskupang.ac.id/repository/pokemon-go-free-hack-ios_GM1094591345.pdfIn PDF document text
    • http://perpus.poltekeskupang.ac.id/repository/free-coins-coin-master-today_GM406889139.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_off00004e9f.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4E9F 25688 bytes
SHA-256: b0665cec8e923ffed137bbe56c2e4957d95195bb502d7244294794dd9c4f85c5
font_01_sfnt_off000089a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x89A9 3608 bytes
SHA-256: 608f0dd4f6bfb6adbccec84228618ee8e4c9e09226d7330efb5300e499d1567f
font_02_sfnt_off00009631.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9631 19540 bytes
SHA-256: 027a0ac85ce36dc2be3e4407e4dc30a7dc039976407b2343120aadb245f18fb9

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