Malicious PDF — malware analysis report

Static analysis result for SHA-256 a86ff9f58ce29093…

MALICIOUS

PDF

40.2 KB Created: 2021-05-13 23:11:09 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 82a4adb329f3cc79fc8fd4be0f80c2de SHA-1: 33face7686730f70bfcef248f745b8554111cc71 SHA-256: a86ff9f58ce2909366b918adf74fe0c4feab4221126032f447be8af820d4d3d1
130 Risk Score

Malware Insights

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

The PDF document contains multiple links to a redirector URL that is associated with malicious activity. The document body text and heuristic firings indicate a lure for a 'free generator' or 'game hack', suggesting the intent is to trick the user into downloading a malicious payload. The primary IOC is the redirector URL used in the lure.

Machine Learning

  • Nyx PDF Classifier clean score 0.0128

Heuristics 4

  • 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.
  • 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/406889139/coin-master-free-spins-link-today-twitter-game-hack In 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_003_off00003637.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3637 24956 bytes
SHA-256: 04e1eb8ae81f86f15bb60bb586c9cd0cdc4a859729f3f323c0dd661d6b632e41
font_01_sfnt_off00006ea9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6EA9 3380 bytes
SHA-256: 1dd933c112880b232546f3aab6a17784a8f412d39fd551cc6eb31c5a04c3ce57
font_02_sfnt_off00007a91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7A91 18572 bytes
SHA-256: 0871f56d6391a8b70b8bf0822360b4899fdb6849640762771593082ddaefd0d3

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