PDF malware analysis — malicious · cc6744650c4be334

MALICIOUS

PDF

107.3 KB Created: 2018-06-12 09:41:10 -04:00

MD5: 7512502844777c3d20a3e685ce658b6e SHA-1: cc05a26aff40b48162d7d73b2560fa79351ddc39 SHA-256: cc6744650c4be33449271a04b8b9f5111a2c4facd29b21c5779765bd6e0b56ff

200 Risk Score

Malware Insights

MITRE ATT&CK

T1059.007 JavaScript T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript that triggers a fake Adobe Acrobat update prompt, aiming to deceive the user into clicking 'OK'. Upon user interaction, the script submits a form to a suspicious URL, likely to download a second-stage payload. The presence of JavaScript and the fake update lure strongly suggest a malicious intent to exploit user trust for initial compromise.

Machine Learning

Nyx PDF Classifier malicious score 0.9477

Heuristics 9

PDF auto-runs JavaScript form submission on open critical PDF_OPENACTION_JS_SUBMITFORM

PDF uses /OpenAction to run JavaScript that calls submitForm() with an external HTTP(S) URL. Opening the document triggers the outbound submission path without requiring a normal link click.
PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK

PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
PDF JavaScript shows fake Acrobat updater prompt high PDF_FAKE_ACROBAT_UPDATE_LURE

PDF JavaScript displays Acrobat/update-themed language such as a document rendering engine update or remote connection to Adobe servers. When paired with JavaScript or external submission, this is a social-engineering lure rather than benign document text.
JavaScript action low PDF_JAVASCRIPT

PDF contains a /JavaScript action. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
Embedded JS stream low PDF_JS

PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
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
External URI info PDF_URI

PDF contains an external URL action
Suspicious extracted artifact info EXTRACTED_FILE_STATIC_TRIAGE

One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.
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://cnn.compromisedblog.com/XWVdkYVVTdGxaWEJ2ZUVWMk5sYzNLell4UTBkQ2FrcDVSR3htWVdSVGNVOXVTbFp4VmtoU1lXczVhblJSYkd4R1lYRk1Ta2xDYm5oUVIxZHRjM0JSVmtKUlF6bHBlbEpLVDI0NFpYTlJNbnA1YjI0cmFuaGxTMGxQUVRaNmVIbFhTR3hLYkVORWNGaGlVSE05TFMwMWNsUjRPVGM0T1dJMFRIRjFhRTVWYVhKTFFYaEJQVDA9LS02NjM0NTNjOWYzYzk1YmUzMmVjNTEwZTJmOGZlN2RiZjlhNjg2NTI2?cid=895218202#FDF
- https://cnn.compromisedblog.com/XY1ZWUFNVUkpPRWRLY0ZSbGRXMHpTMXBUYjBFMlNYcEtWVWx1YW5aWE9HOUtlbUY2U1U1bVMyUjZXalpoUkhsRVV5OWFPRmRPWTNGa1ozWTBNR3hITml0Vk1VTkNWSGRFT1dwWVRXZGxaRmhCZFRJd09USTNaVTlLWWpjMVRrRllUVzVrYmpCWmFrNUVNekJEZEVKNlVrMW1PVTVXTURSTU0xWm1aVTFJZG1wQlprdHBaRlZRT1hST01VOXVZMmxLY0RZMVVWbE1lRVpIVmxkM1VsZHNjVVZMTkRCb1JYZE1lV3RCUFMwdFNVbEZWRmx2VkRsaVZWazNZM1phWmxkS2N5dFJkejA5LS0zOWZjN2JlYjVjNGE1MDczNjY3NmViMzAyZTJmYWExYzYxM2YxZDNk?cid=895218202
- https://cnn.compromisedblog.com/XVXpocGEwUnZhVUpUTUhsc1FrNUVXak01V2xGS2FqbGFSRXN5V1RoSGN6VnBWMjVZUjBNdlNFZDBVVVEzTjJselYxaFZjQ3N4VFhaSVNIbGFibVZWZFU1WWJIQnhkRk4xY0U5bEwxTlBhVUV5ZFdsaU5uZGFSRkJsVDJJNEszZEhia1lyYVd0dldrMHdablVyTVdneVFXazJWallyUlhORk0zRmlZbWd2YkhScVFVeGtXV2hhYjBGNmFXRnZhV1p2TkN0Q1prMUhhVE5OT1VKNVlsTjZPVEpyT1ZKalpHRkNTRVJWUFMwdFdYVlZaRkZNWTB0RlkwVlVWR1paZFdoMk5HSnlaejA5LS1lZjBmYzZhY2IzMmE5Nzk1YjRhOGFiZTQ1Yzk2M2ExYTlkZWZkYzU5?cid=895218202
- https://cnn.compromisedblog.com/XU0RnemVHcFlMMkpwV1hOVWJXcEZlR2wyYjBrMVN6TmlUekJQVW14bGJUWnRXRWxWVW1SUlJuRXhSbTVZYzNGdVRVeHBjbmhyZHpaWFQyNU1aRmRTUm5CVFVGWlhjbkJZZWpkUGRqYzJObnBEWW05bmVWWlViakZWY200emFqa3hkMFpNU1VRMlkyeEhWbVZyT1d0WVlUQmFNeTlNY1hGS016VTRLMDQ1UWxjdlIwODNNV3RyZUcxUVRWRTJiRmQxYVU5d1prTkZiRTlYUVV0cmRWUlVkWGgzWVc0cldHcEdWVW8wUFMwdGVHdzRhMEpRTm01YUsycFdSVlpMZWpKSE5YTnhRVDA5LS01YzUwOTJhOWJkMjdmZDkwMWIxZWZiZmM1MzBiNGY1YWI2M2U1ODIx?cid=895218202
- https://cnn.compromisedblog.com/XY1ZWUFNVUkpPRWRLY0ZSbGRXMHpTMXBUYjBFMlNYcEtWVWx1YW5aWE9HOUtlbUY2U1U1bVMyUjZXalpoUkhsRVV5OWFPRmRPWTNGa1ozWTBNR3hITml0Vk1VTkNWSGRFT1dwWVRXZGxaRmhCZFRJd09USTNaVTlLWWpjMVRrRllUVzVrYmpCWmFrNUVNekJEZEVKNlVrMW1PVTVXTURSTU0xWm1aVTFJZG1wQlprdHBaRlZRT1hST01VOXVZMmxLY0RZMVVWbE1
- http://www.w3.org/1999/02/22-rdf-syntax-ns#
- http://ns.adobe.com/xap/1.0/
- http://purl.org/dc/elements/1.1/
- http://ns.adobe.com/xap/1.0/mm/
- http://ns.adobe.com/tiff/1.0/
- http://ns.adobe.com/exif/1.0/

Extracted artifacts 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0012_000.js` `464a063ffb447872c5c71eee4e1e044e62594c0bfdb80de8af5fcbd4ce7cfaf1`	pdf-javascript-stream	PDF /JS object 12 at offset 0x180A	601 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).
`javascript_obj0012_001.js` `54ec63fcb6cc416b8b4d0f542b807e57fc0269b68b41176501fe248732b420b5`	pdf-javascript-stream	PDF /JS object 12 at offset 0x1831	103726 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 8 long base64-like blob(s).
`font_00_cff_off00019653.bin` `9340d372ad75a105fdb1627a30e96f892e0dc7d9588c0150cf06b4fa72281cc0`	pdf-font-stream	PDF embedded font (cff) at offset 0x19653	4575 bytes

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