Malicious PDF — malware analysis report

Static analysis result for SHA-256 2553eeb09ea3f515…

MALICIOUS

PDF

15.9 KB Created: 2019-04-30 06:35:20 +01:00 Authoring application: mPDF 5.7
MD5: fc3f71c275dc992f6619f0a9fb3fbd26 SHA-1: f27a818026ce3c33c817cd3ed5cd94e152bb26fc SHA-256: 2553eeb09ea3f5154c5c9e3feaf877e5effb1017d21ee2b393656ccfb682a83b
90 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious File

The PDF was flagged by a machine learning classifier as malicious and contains a large number of embedded URLs. The heuristic 'PDF_SEO_LINK_FARM' indicates that the PDF is designed to host a mass of external links, likely for SEO manipulation or to distribute further malicious content. While the URLs themselves are currently marked as benign, the sheer volume and the ML classification suggest a malicious intent, possibly to lure users to malicious sites or to mask other malicious activities. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9892

Heuristics 2

  • 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.
  • 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 http://xiixmcuin.linkpc.net/5209202208205201/Knock-Knock-Jokes-for-Kids-301-Hilarious-and-Funny-Knock-Knock-Jokes-by-Lizzy-Burbank.pdf
    • http://xiixmcuin.linkpc.net/5209202208204207/Knock-Knock-Jokes-for-Kids-50-Funny-Knock-Knock-Jokes-for-Kids-Funny-and-Hilarious-Joke-Books-for-Children-by-Johnny-B-Laughing.pdf
    • http://xiixmcuin.linkpc.net/2203208207207208/A-Foldout-History-of-Antidepressants-A-Timeline-for-Amateurs-and-Aficionados-by-Knock-Knock.pdf
    • http://xiixmcuin.linkpc.net/2200203209200207/Feet-to-the-Stars-and-other-stories-by-Susan-Midalia.pdf
    • http://xiixmcuin.linkpc.net/4208202209203209/Boo-Who-And-Other-Wicked-Halloween-Knock-Knock-Jokes-by-Katy-Hall.pdf
    • http://xiixmcuin.linkpc.net/2205204200208/Take-a-Chance-on-Me-by-Susan-Donovan.pdf
    • http://xiixmcuin.linkpc.net/5209202208208200/101-Knock-Knock-Jokes-for-Kids-by-Arnie-Lightning.pdf
    • http://xiixmcuin.linkpc.net/1203200200207207/Knock-Knock-Psychic-Visions-5-by-Dale-Mayer.pdf
    • http://xiixmcuin.linkpc.net/4203203205209205/Ain-t-Too-Proud-to-Beg-Dog-Walkers-1-by-Susan-Donovan.pdf
    • http://xiixmcuin.linkpc.net/1207201209203205/Ain-t-Too-Proud-to-Beg-Dog-Walkers-1-by-Susan-Donovan.pdf
    • http://xiixmcuin.linkpc.net/5201205205208209/Becoming-Free-in-the-Cotton-South-by-Susan-Eva-O-39-Donovan.pdf
    • http://xiixmcuin.linkpc.net/3206205208201200/Sea-of-Love-Bayberry-Island-1-by-Susan-Donovan.pdf
    • http://xiixmcuin.linkpc.net/9209200203/Knock-Knock-My-Dad-s-Dream-for-Me-by-Daniel-Beaty.pdf
    • http://xiixmcuin.linkpc.net/5209202208209202/Cliches-amp-Platitudes-For-All-Occasions-by-Knock-Knock.pdf
    • http://xiixmcuin.linkpc.net/5209202207206204/Knock-Knock-by-Anna-Clara-Tidholm.pdf
    • http://xiixmcuin.linkpc.net/5209202207203200/Knock-Knock-Who-s-There-by-James-Hadley-Chase.pdf
    • http://xiixmcuin.linkpc.net/5209202208208204/Camp-Knock-Knock-by-Betsy-Duffey.pdf
    • http://xiixmcuin.linkpc.net/4205201203201204/Moondance-Beach-Bayberry-Island-3-by-Susan-Donovan.pdf
    • http://xiixmcuin.linkpc.net/5209202208205200/Knock-Knock-by-Kaori-Takahashi.pdf
    • http://xiixmcuin.linkpc.net/5209202208204208/Knock-Knock-by-Jules-Feiffer.pdf
    • http://xiixmcuin.linkpc.net/4203203205209205/Ain-t-T

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