Malicious PDF — malware analysis report

Static analysis result for SHA-256 139af5749a6f4052…

MALICIOUS

PDF

39.1 KB Created: 2021-05-20 19:21:18 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-12
MD5: b745c503abd54bede0bfe9ab5a53b4cc SHA-1: 17fad455ff1d34d83a89ed743e9e891a50b2588e SHA-256: 139af5749a6f405202fd6f8ec5eac189bcd84f32fef9684f26e0c5f1f5d7e78b
200 Risk Score

Malware Insights

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

The PDF contains multiple links to websites offering 'free generators' and 'game hacks', which are common lures for social engineering attacks. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' and 'PDF_GAME_HACK_REDIRECT_LURE' indicate these links point to known malicious infrastructure. The 'SE_CLICKFIX' heuristic suggests the document may instruct users to execute commands, further supporting a malicious intent to trick users into compromising their systems.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8060

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.
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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/479516143/minecraft-free-games-no-download-game-hack In PDF document text
    • https://min2mojokerto.sch.id/__statics/gudangsoal/files/free-coins-coin-master-blog_GM406889139.pdfIn PDF document text
    • https://min2mojokerto.sch.id/__statics/gudangsoal/files/free-minecraft-alt-accounts_GM479516143.pdfIn PDF document text
    • https://min2mojokerto.sch.id/__statics/gudangsoal/files/best-free-robux-sites_GM431946152.pdfIn PDF document text
    • https://min2mojokerto.sch.id/__statics/gudangsoal/files/free-robux-on-iphone_GM431946152.pdfIn PDF document text
    • https://min2mojokerto.sch.id/__statics/gudangsoal/files/robux-fun-hack_GM431946152.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_002_off00003528.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3528 24316 bytes
SHA-256: 42d016ac85a95dffe1ec4d0613c7da5e2bdd3e08f15f451a90ef613a4c1252d1
font_01_sfnt_off00006ccf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6CCF 2820 bytes
SHA-256: 972979c3a46100cf5f8fd289bc6fbd2496ff75fec0e3f6753648c72ec6eba714
font_02_sfnt_off0000766e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x766E 18548 bytes
SHA-256: d4bb8cf493148b268d6586f082826380d12fe2e65f99ddf9ec2ebd5ad80c35a7

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