Malicious PDF — malware analysis report

Static analysis result for SHA-256 d77bffb38c2ebad8…

MALICIOUS

PDF

39.0 KB Created: 2021-05-10 13:16:17 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: e7ff05af9c75be243cc68bf7f12fbe5c SHA-1: e65df7b5d8dc62b14816fe0cd26523759d7f95ca SHA-256: d77bffb38c2ebad84220b24b4f0eca1f70aefdb7a71d37f0c5bdd13cbcb45ce6
200 Risk Score

Malware Insights

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

The PDF file contains multiple links to malicious redirectors, masquerading as 'free Robux codes' or 'game hacks'. It impersonates PayPal to trick users into clicking these links, which likely lead to further malicious content or credential harvesting. The embedded URLs and the document's content strongly suggest a phishing and social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9438

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.
  • 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.xyz/app/431946152/how-to-get-free-robux-codes-2021-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.xyz/app/431946152/how-to-get-free-robux-codes-2021-game-hack In PDF document text
    • http://asiasieja.pl/images/moon-static-coin-master-generator-hacks-free_GM406889139.pdfIn PDF document text
    • http://asiasieja.pl/images/coin-master-free-coins-generator_GM406889139.pdfIn PDF document text
    • http://asiasieja.pl/images/free-clothing-on-roblox_GM431946152.pdfIn PDF document text
    • http://asiasieja.pl/images/roblox-controversy_GM431946152.pdfIn PDF document text
    • http://asiasieja.pl/images/free-spins-on-coin-master-game_GM406889139.pdfIn PDF document text
    • http://asiasieja.pl/images/roblox-speed-hack_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
font_00_sfnt_off00003922.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3922 25640 bytes
SHA-256: 9784efb7e515ae875f050fad3227e1a3143db696803f7a3e158b0b552c513033
font_01_sfnt_off000074f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x74F2 18856 bytes
SHA-256: 204886f9a3a3d456a8ba924f34e84de86e5dda13901e78a872ce278a746af401

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